ROAD SAFETY AUDIT
Route 9 (Turnpike Road) at Central Street/ Oak Hill Road
and White Bagley Road/ Breakneck Hill Road Town of Southborough
April 8, 2014
Prepared For:
Prepared By:
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table of Contents
Background .................................................................................................................................1
Project Data .................................................................................................................................1
Project Location Description .....................................................................................................2
Audit Observations and Potential Safety Enhancements........................................................9
Summary of Road Safety Audit...............................................................................................20
List of Appendices
Appendix A
Appendix B.
Appendix C.
Appendix D.
Appendix E.
RSA Meeting Agenda
RSA Audit Team Contact List
Detailed Crash Data
Speed Regulations
MassDOT Count Data
List of Figures
Figure 1.
Figure 2.
Figure 3.
Locus Map.............................................................................................................................. 6
Route 9 at Central Street/ Oak Hill Road ............................................................................... 7
Route 9 at White Bagley Road/ Breakneck Hill Road ........................................................... 8
List of Tables
Table 1. Participating Audit Team Members.................................................................................................... 2
Table 2. Potential Safety Enhancement Summary – Route 9 at Central Street/ Oak Hill Road ..................... 21
Table 3. Potential Safety Enhancement Summary – Route 9 at White Bagley Road/ Breakneck Hill Road . 24
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Background
The Federal Highway Administration defines a Road Safety Audit (RSA) as the formal safety
examination of an existing or future road or intersection by an independent, multidisciplinary team. The
purpose of an RSA is to identify potential safety issues and possible opportunities for safety
improvements considering all roadway users. Specific objectives of an RSA include, but are not limited
to, minimizing the risk and severity of road crashes that may be affected by the existing or future roadway
at a specific location or nearby network, and improving the awareness of safe design practices which are
likely to result in safety benefits based upon potential safety concerns. The Massachusetts Department of
Transportation (MassDOT) has embraced the RSA program as a low cost opportunity to make significant
safety improvements at any number of stages ranging from project development and planning through
existing operation.
A Road Safety Audit was scheduled for the intersections of Route 9 (Turnpike Road) at Central Street/
Oak Hill Road and Route 9 (Turnpike Road) at White Bagley Road/ Breakneck Hill Road as part of the
pavement micromilling and resurfacing project (MassDOT Project Number 607488; Contract Number
68386, Assignment Number 9) along approximately 1.8 miles of Route 9, from just west of White Bagley
Road/ Breakneck Hill Road (milemarker 111.2±) east to the Southborough/ Framingham town line
(milemarker 113.0±). Both intersections fall within 2011 Highway Safety Improvement Program (HSIP)
clusters within the Top 5% of the high crash locations in the Boston Region, and therefore are subject to a
required RSA. In 2010 and 2009, the intersection of Route 9 at Oak Hill Road/ Central Street did rank in
the Statewide Top 200 high crash location report at 195 and 190, respectively.
Project Data
A Road Safety Audit for the signalized intersections of Route 9 (Turnpike Road) at Central Street/ Oak
Hill Road and Route 9 (Turnpike Road) at White Bagley Road/ Breakneck Hill Road was held on
Tuesday, March 4, 2014 at the Town of Southborough Department of Public Works (DPW) in
Southborough, Massachusetts. Table 1 provides a list of the participating audit team members and their
associated affiliation. As shown, the team represents a multidisciplinary group ranging from planning, to
engineering, to local and state officials. Detailed crash history data from both MassDOT and the Town of
Southborough Police Department, and associated collision diagrams were reviewed prior to an in-field
visit to the intersections. Additionally, traffic volume data provided by MassDOT was made available.
These data are provided in the Appendix for reference.
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 1. Participating Audit Team Members
Audit Team Member
Agency/Affiliation
Mark Abbott
Central Transportation Planning Staff
Jennifer Burney
Town of Southborough – Town Planner
Alolade Campbell
MassDOT – District 3
Chris DeMoranville
Town of Southborough DPW – Staff Engineer
Karen Galligan
Town of Southborough DPW – Superintendent
Richard Handfield
MassDOT – District 3
Lieutenant Sean James
Police Department – Town of Southborough
Chief Joe Mauro
Fire Department - Town of Southborough – Fire Chief
Corey O’Connor
MassDOT – Highway Division – Safety Section
Hud Quistorff
MassDOT – District 3
Lisa Schletzbaum
MassDOT – Highway Division – Safety Section
John Osorio
Greenman-Pedersen, Inc.
Erica Guidoboni
Greenman-Pedersen, Inc.
Project Location and Description
The RSA focused on two signalized locations along Turnpike Road (Route 9) in Southborough,
Massachusetts. As shown in Figure 1, the intersection of Route 9 at Central Street/ Oak Hill Road and
Route 9 at White Bagley Road/ Breakneck Hill Road, approximately 0.8 miles to the west, were the
focus. No signals fall between these two signalized intersections along the Route 9 corridor. Route 9 is an
east-west roadway classified as an urban principal arterial under MassDOT jurisdiction. Within the study
area, Route 9 is generally two lanes in each direction and divided by a concrete median. The speed limit is
posted at 45 miles per hour (mph) in the vicinity of the intersection of Central Street/ Oak Hill Road and
50 mph in the vicinity of White Bagley Road/ Breakneck Hill Road. Land uses along Route 9 within the
study area are generally commercial, office and retail uses.
The two intersections included in the audit are discussed in detail below.
Route 9 at Central Street/ Oak Hill Road
Central Street intersects Route 9 from the north to form a four-way signalized intersection with Oak Hill
Road from the south. Both Central Street and Oak Hill Road are classified as urban minor arterials under
local jurisdiction. Central Street provides vehicular traffic with one travel lane in each direction, running
north-south between Route 9 and Route 30 to the north. The posted speed limit on Central Street is 30
mph. At the intersection with Route 9, Central Street provides one wide general purpose lane for all
traffic. Oak Hill Road provides vehicular traffic with one travel lane in each direction, running northsouth between Route 9 and the Ashland Town line to the south. The posted speed limit on Oak Hill Road
is 30 mph and the roadway is signed as thickly settled residential. At the intersection with Route 9, Oak
Hill Road widens to provide an exclusive left-turn lane, one through lane, and an exclusive right-turn
lane. Both eastbound and westbound Route 9 approaches to the intersection provide an exclusive left-turn
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
lane, two through lanes, and a shared through/right-turn lane. Right turns on red are prohibited in the
northbound, southbound and westbound directions.
Crosswalks are provided across all
approaches to the intersection, along with
pedestrian push buttons and exclusive
pedestrian phasing. Curb ramps with
detectable warning strips are provided on
all corners of the intersection. Narrow
sidewalks are provided along both sides of
Route 9 in the vicinity of the intersection.
To the west sidewalks are provided for
approximately 550 feet to Woodland Road,
while to the east of the intersection
sidewalks run approximately 1,000 feet
along the south edge of Route 9 and
continue to the I-90 interchange along the
north edge. Sidewalks are also present
along the east side of Central Street and
Oak Hill Road. Land uses in the immediate
Route 9 at Central Street/ Oak Hill Road:
vicinity of the intersection include a Walgreens, a
Taken from Southwest corner
Mobil station and small office/business uses.
Figure 2 presents an aerial view of the intersection.
Crash data were provided by the Southborough Police Department for the most recent complete threeyear period (2010-2012) available. A total of 42 crashes were reported at the intersection according to the
police crash records. Of these crashes, the most common crash-type were rear-end crashes, with 25
crashes (approximately 60%) reported. Of these rear-end crashes, 14 were reported to occur in the
eastbound direction of travel, six in the westbound direction, four northbound, none southbound and one
rear-end crash direction unreported. The next most frequent crash-type were angle crashes (11 reported),
followed by five sideswipes and one single vehicle crash, involving a MassDOT sign and the signal box
in snowy conditions. Of the total 42 crashes reported, 39 (approximately 93%) reported severity as being
limited to property damage, with the remaining three crashes reporting injury. No fatalities were reported
within the Southborough Police Department records.
In addition to the crash data provided by the police department, the MassDOT crash database was utilized
to supplement the local crash data and complete a five-year time period of crash data. The MassDOT
database was queried back to 2008, up to the latest year available of 2011. Within this time period (2008­
2011), an additional 34 crashes were determined to be supplementary to the current 42 local police
department crashes, yielding a total of 76 crashes at this intersection within the five-year time period of
2008-2012. Of these additional crashes, the most common crash-type were rear-end crashes, with 21
crashes (approximately 62%) reported. Of these rear-end crashes, 11 were reported to occur in the
eastbound direction of travel, six in the westbound direction, one northbound, and three southbound. The
next most frequent crash-type were angle crashes (six reported), followed by five sideswipes and one
single vehicle crash. Of the additional 34 MassDOT reported crashes, 24 (approximately 93%) reported
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
severity as being limited to property damage, with eight crashes reporting injury and two unreported. No
fatalities were reported within the MassDOT crash database.
In addition to the collision summary, crash occurrence also is compared to the volume of traffic through a
particular intersection. Accordingly, the crash rate is compared to the district-wide average crash rate for
a signalized intersection. An intersection crash rate is a measure of the frequency of collisions compared
to the volume of traffic through an intersection and is presented in crashes per million entering vehicles
(c/mev). For signalized intersections within District 3, the latest published average crash rate is 0.89
c/mev. A comparison of the calculated crash rate to this average rate can be used to establish the
significance of collision occurrence. The calculated crash rate for Route 9 at Central Street/ Oak Hill
Road is 0.75 c/mev, which falls below the average for District 3 signalized intersections. This rate was
determined based on the 76 queried crashes, over the course of 5 years, utilizing MassDOT counts from
September 24, 2013. Crash data summaries, a collision diagram and a crash rate worksheet are included
in the Appendix of this report.
Route 9 at White Bagley Road/ Breakneck Hill Road
White Bagley Road intersects Route 9 from the north to form a four-way signalized intersection with
Breakneck Hill Road from the south. Both White Bagley Road and Breakneck Hill Road are classified as
urban collectors under local jurisdiction. White Bagley Road provides one lane in each direction for
north-south vehicular travel between Route 9 to the south and Route 30 to the north. White Bagley Road
bisects the southern portion of the Sudbury Reservoir and provides access to residential neighborhoods
and Sudbury Reservoir trail networks. The posted speed limit on White Bagley Road is 25 mph.
Breakneck Hill Road provides one general purpose lane for all vehicular traffic running in a north-south
direction between Route 9 to the north and Woodland Road to the south. The posted speed limit on
Breakneck Hill Road is 20 mph in the vicinity of the intersection. At the intersection with Route 9, White
Bagley Road and Breakneck Hill Road provide one general purpose travel lane for all vehicular traffic.
The Route 9 approaches to the intersection provide an exclusive left-turn lane, two through lanes, and an
exclusive right-turn lane for eastbound
and westbound traffic.
One crosswalk is provided across the
western leg of Route 9, with pedestrian
push buttons/heads provided only for
this crossing. The purpose of this
crossing is limited to provide safe access
to the signal cabinet which is on the
northwestern corner of the intersection.
Sidewalks in the vicinity of the
intersection are limited to a narrow,
approximately 200 foot long sidewalk
provided along the western edge of
Breakneck Hill Road, south of Route 9.
The terminus of this sidewalk provides
access to the Crossings shopping plaza on
Route 9 at White Bagley Road/ Breakneck Hill
Road: Taken from Southeast corner
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
the southeast corner of the intersection, though a crosswalk across Breakneck Hill Road is not provided.
Land in the vicinity of the intersection is largely residential along Breakneck Hill Road, aside from the
Crossing shopping plaza on the southeast corner of the intersection. To the north, White Bagley Road is
essentially a land bridge which bisects the Sudbury Reservoir. The presence of the reservoir provides a
unique challenge in that sidewalks are not feasible along White Bagley Road. Figure 3 presents an aerial
view of the intersection.
Crash data were provided by the Southborough Police Department for the most recent complete threeyear period (2010-2012) available. A total of 18 crashes were reported at the intersection according to the
police crash records. Of these crashes, the most common crash-type were rear-end crashes, with 14
crashes (approximately 78%) reported. Of these rear-end crashes, 11 were reported to occur in the
eastbound direction of travel, two in the westbound direction, one northbound and none southbound. The
remaining crashes consisted of two sideswipe crashes in the westbound direction, one angle crash
involving an eastbound left-turn with westbound through movement, and one single vehicle crash
involving a collision with the Route 9 median in snowy conditions. Of the total 18 crashes reported, 17
(approximately 94%) reported severity as being limited to property damage, with one crash reporting
injury. No fatalities were reported within the Southborough Police Department records.
As with the previous intersection, the MassDOT crash database was utilized to supplement the local crash
data and complete a five-year time period of crash data. The MassDOT database was queried back to
2008, up to the latest year available of 2011. Within this time period (2008-2011), an additional 25
crashes were determined to be supplementary to the current 18 local police department crashes, yielding a
total of 43 crashes at this intersection within the five-year time period of 2008-2012. Of these additional
crashes, the most common crash-type were rear-end crashes, with 17 crashes (approximately 68%)
reported. Of these rear-end crashes, 12 were reported to occur in the eastbound direction of travel and five
in the westbound direction. The next most frequent crash-type were sideswipe crashes occurring in the
same direction of travel (four reported), followed by two angle crashes and two single vehicle crashes. Of
the additional 25 MassDOT reported crashes, 17 (approximately 68%) reported severity as being limited
to property damage, with eight crashes reporting injury. One of the injury crashes resulted in a fatality on
July 13, 2009 involving a motorcyclist rear-ending a sport utility vehicle travelling in the eastbound
direction on Route 9 at 4:02 PM, during clear and dry pavement conditions.
The calculated crash rate for Route 9 at White Bagley Road/ Breakneck Hill Road is 0.45 c/mev, which
falls below the average for District 3 signalized intersections. This rate was determined based on the 43
queried crashes, over the course of 5 years, utilizing MassDOT counts from September 24, 2013. Crash
data summaries, a collision diagram and a crash rate worksheet are included in the Appendix of this
report.
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Figure 1.
Locus Map
RSA Study Intersection
Source: Google Maps
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Figure 2.
Route 9 at Central Street/ Oak Hill Road
S Traffic Signal
S
Source: Google Earth
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Figure 3.
Route 9 at White Bagley Road/ Breakneck Hill Road
S Traffic Signal
S
Source: Google Earth
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Audit Observations
Following an introduction to the RSA process and a summary of existing geometry, signal operations and
crash and speed data, the audit participants were asked to discuss safety concerns at each of the two
subject intersections. Audit team members then drove to each of the intersections as a team, at which time
observations were offered in the field. A summary of those in-field safety observations and potential
deficiencies is provided below:
Route 9 at Central Street/ Oak Hill Road
• Pavement Conditions – Moderate rutting was noted along Route 9 at the time of the audit.
Pavement rutting can promote rear-end crashes as asphalt bleeding usually occurs around the ruts.
Additionally the ruts can collect standing water. This issue could have contributed to the
numerous rear-end type crashes which occurred along Route 9 at this intersection. Approximately
49% of all the crashes queried at this intersection were rear-end crashes along Route 9.
• Pavement Markings – Markings were observed to be visible, clear and reflective, with some wear
at the time of the audit. Pavement markings provide clarity to motorists and assist in the
reduction of nighttime crashes of which approximately 18% of the queried crashes were reported
to have occurred.
• Lane Geometry – Lane geometry was clear and
properly signed along Route 9, both in advance of the intersection and at the
intersection itself. The Central Street southbound
approach is one general
purpose lane, not requiring any
signage or markings, although
it is currently being used as two
lanes by vehicular traffic in
practice. In the field it was
noted that left-turning vehicles
generally utilized the left side
Route 9 at Central Street/ Oak Hill Road:
of the wide approach as a
Eastbound Route 9 signage
second lane, however when a
through vehicle would utilize this “lane” this would confuse opposing northbound traffic and
misalign with the receiving lane on Oak Hill Road. This is due to the lack of definition of this
lane. Motorists traveling northbound on Oak Hill Road have no indication of what maneuver
vehicles traveling southbound on Central Street are going to execute, unless a turn-signal is
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
utilized and noticed. This observation was also documented in the Central Transportation
Planning Staff (CTPS) Safety and Operations Analyses 1 memorandum in 2012.
The Oak Hill Road northbound approach has clear and proper lane markings, however does not
provide any signage in advance of the intersection advising drivers of the exclusive turn lanes
ahead. Additionally, the Oak Hill Road approach provides an approximately 90 foot exclusive
right-turn lane that is limited in length by two utility poles on the eastern side of the roadway.
This lane is heavily utilized, particularly in the morning peak hour with approximately 300
vehicles per hour turning right at this intersection, to access I-90 to the east. Currently the
approximately 90 foot storage provided in this lane is not sufficient, as through queues block
access to this lane, creating frustrations and delays. These geometry issues may contribute to the
21% angle crashes at this location.
1
•
Narrow Lanes- Through lanes at the intersection are approximately 11 feet wide while turn lanes
are less than 10 feet wide. Shoulders at the intersection vary from 1-2 feet in width. Narrow lane
approaches may contribute to the 12% sideswipe type crashes at this location.
•
Excessive Queuing – Route 9 experiences a heavy rolling queue in both the eastbound and
westbound directions during the morning and evening commuter peak periods. With this heavy
queue comes aggressive and distracted driving potential, as drivers are waiting 2-3 cycle lengths
to pass through one intersection. This issue could have contributed to the numerous rear-end type
crashes which occurred along Route 9 at this intersection. Approximately 49% of all the crashes
queried at this intersection were rear-end crashes along Route 9.
•
Signal Equipment –Backplates for vehicle signal heads are present at this location, however they
are not retroreflective, and therefore potentially less visible. Emergency preemption is installed at
this intersection, however the Southborough Fire Department Chief noted that in the southbound
Central Street direction of travel the Department has issues with the opticom. In the field the
opticom was observed to be positioned slightly to the east (left) of where it should be aligned for
oncoming Central Street emergency vehicles.
•
Clearance Intervals – Clearance intervals within a cycle length directly relate to the occurrence of
red light running, as well as rear-end type crashes. Of the crashes reviewed at this intersection,
approximately 61% were rear-end type crashes.
•
Vertical Curvature/ Sight Distance – Route 9 within Southborough is a rolling terrain. In
particular, the eastbound and westbound approaches to the intersection are up-hill crest vertical
curves which may contribute to limited sight distances for drivers approaching the intersection. It
was noted that large trucks along Route 9 sometimes block the view of the overhead signal when
travelling behind them in traffic due to the rolling hills along Route 9. In addition, the northbound
Oak Hill Road approach experiences a vertical curve with a crest at the nearby Walgreens
driveway, followed by a downslope approaching the intersection with Route 9.
Safety and Operations Analyses Southborough Memorandum, Central Transportation Planning Staff, October 2012
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Additionally, vehicles exiting the Walgreens driveway onto Oak Hill Road struggle with poor
intersection sight distance due to the vertical crest curve looking right, as well as an adjacent
overgrown site to the right. Referring to the collision diagram within the Appendix of this RSA,
crashes 15, 18, 27, and 58 may be related to this driveway. The overgrown site directly to the
south of the Walgreens is proposed to be redeveloped into a housing development, which will be
subject to clearing this overgrown vegetation, however will be generating additional turning trips
in this difficult segment of roadway.
• Bicycle Accommodations – There are currently no bicycle accommodations along the Route 9
approaches to the intersection, nor at the intersection itself. Bicycle accommodations and signage
is limited to one sign on the Central Street approach that advises bicyclists to wait for green
signal at the Central Street stop bar.
• Pedestrian Accommodations – Crosswalks cross all four approaches to the intersection along with
pedestrian push buttons and signal heads on each corner for the associated crossing. An audio
alert is also provided during the exclusive pedestrian phase of the signal. The pedestrian signal
heads do not provide a countdown notifying pedestrians of safe time remaining to cross.
Additionally, a fatal incident in which a pedestrian did not utilize the provided pedestrian phase
was mentioned by the Southborough Police Lieutenant during the audit.
• Signage – While green directional signs notifying
drivers of the approaching side streets are provided
in advance of the intersection along Route 9, at the
actual signalized intersection the street signs for
Oak Hill Road and Central Street are not
prominent. They are mounted on the standard street
sign posts at the end of each street, and are onesided and therefore blank to one direction of traffic
on Route 9. In the spring/summer seasons the sign
for Central Street appears to be covered by the
nearby trees. Motorists that are unsure of the
upcoming intersection side-streets along Route 9
may approach the intersection and stop abruptly
upon realization that they have reached their turn,
causing rear-end or even sideswipe crashes if they
make a quick lane change.
• Speeds – While speed limits are posted
Route 9 at Central Street/ Oak Hill Road:
along all approaches to the intersection, it
One-sided Central Street sign
was noted by the Southborough Police
Department that many vehicles travel along Route 9 well in excess of the posted speed limit of 45
mph in the vicinity of this intersection. Excessive speeds contribute to crashes of all types, and
increase the severity of those crashes.
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
• Access Management – Woodland Road is a local roadway that runs north-south and intersects
Route 9 from the south to form an unsignalized T-shaped intersection approximately 770 feet
west of the intersection with Central Street/ Oak Hill Road. The median on Route 9 is broken to
allow westbound left-turns onto Woodland Road from Route 9. The Woodland Road approach is
restricted to right-turns only. During the audit the team discussed the excessive queuing that
occurs with the left-turns onto Woodland from Route 9 westbound. These queues spill out of the
provided left-turn storage lane into the westbound mainline which may contribute to rear-end or
sideswipe crashes to the west of the signal. Referring to the collision diagram within the
Appendix of this RSA, crashes 29, 61, and 67 may be related to this issue. In the eastbound
direction, queuing from the signal backs up through the intersection with Woodland Road during
peak periods, blocking turns and creating a situation that encourages angle-type “courtesy
crashes” for the westbound left-turns. A “DO NOT BLOCK INTERSECTION” sign is provided
for eastbound traffic.
Route 9 at White Bagley Road/ Breakneck Hill Road
• Pavement Conditions – Moderate rutting was noted along Route 9 at the time of the audit. DPW noted that major drainage issues exist on
the northwest corner of the intersection.
Pavement rutting can promote rear-end crashes as asphalt bleeding usually occurs around the
ruts. Additionally the ruts can collect standing
water. This issue could have contributed to the numerous rear-end type crashes which
occurred along Route 9 at this intersection. Approximately 70% of all the crashes queried at this intersection were rear-end crashes along
Route 9.
• Pavement Markings – Aside from a stop bar, the minor street approaches of White Bagley
Road and Breakneck Hill Road completely
Source: Bing Maps
lack pavement markings, specifically center
lane striping. Markings along Route
Route 9 at White Bagley Road/ Breakneck Hill
9 were observed to be visible with
Road: Lane Geometry on Route 9, looking east
some wear at the time of the audit.
Pavement markings provide clarity to motorists and assist in the reduction of nighttime crashes of
which approximately 12% of the queried crashes were reported to have occurred
• Lane Geometry – Both the eastbound and westbound approaches along Route 9 provide an
exclusive left-turn lane, two through lanes, and an exclusive right-turn lane for vehicles
approaching the intersection. However both receiving sides of the intersection provide a third
receiving lane for vehicles leaving the intersection. This may encourage through travelling
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
aggressive drivers to travel through the intersection and continue straight from the right-turn only
travel lane, though crash data queried does not present this phenomenon.
•
Narrow Lanes- Through lanes at the intersection are approximately 12 feet wide while turn lanes
are less than 11 feet wide. Shoulders along Route 9 at the intersection vary from 1-2 feet in width.
Narrow lane approaches may contribute to the 14% sideswipe type crashes at this location.
•
Vegetation – Large trees line Route 9 on the south side, west of the intersection. These trees
create a heavy shadow over the eastbound approach lanes to the intersection, which experiences
numerous rear-end crashes. Approximately 70% of all the crashes queried at this intersection
were rear-end crashes along Route 9, with approximately 77% of the rear-end crashes along
Route 9 occurring the eastbound direction at this location.
•
Median Conditions – The eastbound median impact attenuator was noted to be damaged and in
need of replacement in order to maintain its purpose. Damage was most likely due to heavy
snow/plow activity or possibly a crash in snowy conditions.
•
Excessive Queuing – Route 9 experiences a heavy rolling queue in both the eastbound and
westbound directions during the morning and evening commuter peak periods. With this heavy
queue comes aggressive and distracted driving potential, as drivers are waiting 2-3 cycle lengths
to pass through one intersection. This issue could have contributed to the numerous rear-end type
crashes which occurred along Route 9 at this intersection. Approximately 70% of all the crashes
queried at this intersection were rear-end crashes along Route 9.
•
Signal Equipment – There are no backplates for vehicle signal heads which increase visibility of
the signal indications for approaching vehicles. Solar glare travelling eastbound in the morning
and westbound in the evening could play a role in the high percentage of rear-end crashes along
Route 9 that occur at this location. Actuation and emergency preemption were determined to be
functioning properly.
•
Clearance Intervals – Clearance intervals within a cycle length directly relate to the occurrence of
red light running, as well as rear-end type crashes. Of the crashes reviewed at this intersection,
approximately 72% were rear-end type crashes.
•
Bicycle/Pedestrian Accommodations – Aside from the one crosswalk on the western leg of the
intersection on Route 9, there are no other crosswalks for safe/protected pedestrian crossing. In
addition, only one narrow sidewalk exists on the western edge of Breakneck Hill Road. No
bicycle accommodations are provided anywhere at this location, either along the roadways or at
the intersection itself.
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
• Signage – The minor streets
of White Bagley Road and
Breakneck Hill Road are
insufficiently signed as onesided street signs. Travelling
eastbound on Route 9, the
street sign for White Bagley
Road is not visible/ blank.
The same is true travelling
westbound for the street sign
for Breakneck Hill Road. In
addition, the sign for White
Bagley Road is bent 90
degrees and therefore is not
sufficiently visible to any
roadway user. Motorists that
Route 9 at White Bagley Road/ Breakneck Hill
are unsure of the upcoming
Road: bent one-sided street sign, looking east
intersection side-streets
along Route 9 may approach the intersection and stop abruptly upon realization that they have
reached their turn, causing rear-end or even sideswipe crashes if they make a quick lane change.
• Speeds – While speed limits are posted along all approaches to the intersection, it was noted by
the Southborough Police Department that many vehicles travel along Route 9 well in excess of
the posted speed limit of 50 mph in the vicinity of this intersection. In the eastbound direction of
travel, this signal is the first signal in 1.5 miles (from Crystal Pond Road) allowing ample
distance for speeds to
increase over uninterrupted
distance. Excessive speeds
contribute to crashes of all
types, and increase the
severity of those crashes.
Also discussed at the audit
was the potential
relationship the rear-end eastbound crashes at this location could have to the
cloverleaf interchange with
Source: Google Maps
Route 85, approximately
±1,100 feet west of the signal.
Route 9 at White Bagley Road/ Breakneck Hill
In particular, the need for
Road: Eastbound Route 9 signage
vehicles to speed up in order to
safely merge into oncoming eastbound Route 9 traffic from the Route 85 ramp. The terminus of
the ramp is STOP-controlled (not yield) and a rather sharp angle. Therefore motorists must
accellerate from a full stop to approximately 50 mph within the approximately 200 foot merge
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Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
lane provided. While motorists are looking left to assess gaps in the eastbound mainline traffic,
they may not be aware of the extensive queues spilling back from the White Bagley Road/
Breakneck Hill Road signal ahead. This phomonenon could play a role in the numorous rear-end
eastbound crashes on Route 9 at this location.
Potential Safety Enhancements
After the intersection in-field visit, audit participants returned to the Southborough DPW to discuss the
safety issues and consider potential short-term and long-term improvements. Many of the potential
enhancements identified during the RSA have already been considered as part of the design process,
although further design work and consideration may be necessary to determine the feasibility of making
some of the improvements moving forward. A summary of potential safety-related enhancements
discussed at the RSA is provided below:
Route 9 at Central Street/ Oak Hill Road
• Pavement Conditions – Pavement will be replaced as part of the micromilling project, improving
rutting issues. Deeper milling (3 inches) will be performed in proximity to the intersections. This
improvement may decrease the potential number of rear-end crashes in wet or icy roadway
conditions.
• Pavement Markings – Markings will be refreshed as part of the micromilling project.
Consideration will be made to adding dotted lane line extensions for the exclusive turn lanes on
all approaches to the intersection to provide additional definition for drivers. This enhancement
will assist in the reduction of nighttime and sideswipe crashes. Further discussion associated with
the benefits of retroreflective and enhanced pavement markings is available within The Benefits
of Pavement Markings: A Renewed Perspective Based on Recent and Ongoing Research2, a
paper readily available on the Federal Highway Administrations website. Contained within the
study are specific references to nighttime, sideswipe, and lane departure crashes and their
association with pavement markings.
• Lane Geometry – As recommended in the Safety and Operations Analyses memorandum
conducted by CTPS in 2012 at this intersection, the Central Street southbound approach is
currently striped as one general purpose lane, however it is currently being used as two lanes in
practice, with predominately left-turning vehicles utilizing the left edge of the lane as an
exclusive lane, with through/right-turning vehicles utilizing a shared lane in the remaining rightof-way. The recommendation is to provide two delineated approach lanes. There is currently
about 33 feet of roadway right-of-way width available to accommodate the proposed lanes. The
existing double yellow center line would need to be removed and replaced during the remilling
project to allow the for three 11 foot lanes composed of one shared through/right-turn lane, one
11 foot left-turn lane and one 11 foot departure/receiving lane. This enhancement will provide
2
The Benefits of Pavement Markings: A Renewed Perspective Based on Recent and Ongoing Research, Texas
Transportation Institute, in association with the Office of Safety Research and Development at Federal Highway
Administration, August 2008
Page 15
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
clear delineation for oncoming northbound motorists on Oak Hill Road and allow for left-turns
from Central Street to have a dedicated lane alignment to wait for sufficient gaps in northbound
traffic. This improvement will potentially decrease the number of crashes caused by this
phenomenon.
Relocate utility poles on the eastern edge of Oak Hill Road, along the frontage of the Mobil
station to allow for the extension of the northbound exclusive right-turn lane on Oak Hill Road.
Two utility poles would have to be shifted east in order to accommodate a longer, functional
right-turn lane. This enhancement will allow for an operational right-turn lane to alleviate some
of the demand and potentially decrease the number of crashes on this approach.
• Narrow Lanes- As design plans progress, consideration will be made regarding the most efficient
lane widths with consideration to safety, for the intersection approaches.
• Signal Equipment –As discussed in the CTPS memorandum, the signal timing and phasing at
Central Street/ Oak Hill Road is operating optimally and should not be adjusted. In terms of
equipment, the opticom serving the emergency preemption in the southbound Central Street
direction of travel was observed to be positioned slightly to the east (left) of where it should be
aligned for oncoming Central Street emergency vehicles. The opticom should be shifted slightly
west (right) in order to be better aligned with oncoming emergency vehicles.
Install additional signal heads on the mast arms to provide additional visibility to drivers. This
will potentially allow drivers to see the signal display when following closely behind a large
truck. In addition this display could increase visibility with regard to the rolling terrain and
vertical curvature along Route 9. Replace existing backplates with upgraded retroreflective
backplates in order to further visibility of the signal heads and potentially decrease rear-end
crashes. The condition of the dilemma zone detection should also be checked, if present. If not
present, consider installing. This can help alleviate red light running and therefore rear-end
crashes during off-peak hours.
• Clearance Intervals – Yellow and red clearance times need to be confirmed by MassDOT District
3 to determine if they are set to the current standards. In addition, it should be considered if the
clearance times are set for the posted roadway speed limit of 45 mph or perhaps adjusted to
accommodate the actual 85th percentile speeds on Route 9. This potential adjustment will directly
relate to the occurrence of red light running, as well as rear-end type crashes.
• Vertical Curvature/ Sight Distance – Install additional signal heads on the mast arms to provide
additional visibility to drivers. This will potentially allow drivers to see the signal display when
following closely behind a large truck. In addition this display could increase visibility with
regard to the rolling terrain and vertical curvature along Route 9.
Cut back the overgrown vegetation along Oak Hill Road along the currently unoccupied site
directly to the north of the Walgreens driveway. This enhancement will increase visibility and
intersection sight distance for vehicles exiting the Walgreens site and therefore decrease crashes
related to this driveway.
Page 16
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
• Bicycle Accommodations – Enhanced bicycle accommodations will be considered as part of the
remilling project, both along Route 9 and at the intersection along Central Street and Oak Hill
Road. Discussions with MassDOT have and will continue to address how to approach these
accommodations safely. Route 9 does not restrict pedestrians or bicycles within the right-of-way
and therefore accommodations need to be considered, and provided if deemed appropriate. These
accommodations could include bicycle boxes at the intersection, bicycle lane pavement markings
or sharrows, and associated signage.
• Pedestrian Accommodations – In order to further enhance pedestrian
accommodations at the intersection, installing signage on each corner of the
intersection, to remind pedestrians to utilize the push buttons. For instance the
“CROSS ONLY ON (symbolic walk indication) SIGNAL” (R10-2) may
provide additional support to utilize the push buttons provided. Also upgrade
pedestrian accommodations to current ADA standards with pedestrian heads
with countdown display and new pedestrian call buttons.
• Signage – Install street signs for Oak Hill Road and Central Street on the overhead mast arms for
both eastbound and westbound approaches of Route 9. Similar directional signage could also be
useful for Route 9 and directing vehicles to the interchange with Interstate 90, east of the
intersection. This improved signage will potentially reduce the occurrence
of rear-end and sideswipe crashes as motorists unfamiliar with the area will
be less likely to have to make quick turn decisions at the intersection.
Install “LEFT TURN YIELD ON GREEN” (R10-12) sign on the mast arm
for the Central Street southbound approach to the intersection. This sign
exists for the Oak Hill Road approach but is missing for Central Street. This
sign allows for guidance to drivers, reminding that the phasing is not split/
protected and may reduce the occurrence of angle crashes within the
intersection.
Install “Advance Intersection Lane Control” variation (R3-8b) on the
Oak Hill Road approach to the intersection, advising drivers of the
oncoming lane uses. This additional signage may reduce the occurrence of sideswipe crashes as motorists unfamiliar with the area will be less likely to have to make quick turn decisions at the
intersection.
• Access Management – Study the potential of lengthening the westbound left-turn lane storage,
while considering the balance with the left-turn lane storage for eastbound Route 9 at the signal.
This enhancement could reduce spill back of the westbound left-turn queues onto the Route 9
mainline, just west of the signal. This enhancement may decrease the occurrence of rear-end
crashes directly west of the signal along Route 9.
Add pavement markings in the eastbound direction on Route 9 which further discourages
blocking the intersection at Woodland Road. Signage should be installed listing the fines
Page 17
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
associated with blocking the intersection, mounted under the existing “DO NOT BLOCK
INTERSECTION” sign. This enhancement may decrease the occurrence of angle-type “courtesy
crashes” for the westbound left-turns.
Route 9 at White Bagley Road/ Breakneck Hill Road
• Pavement Conditions – Pavement will be replaced as part of the remilling project, improving
rutting issues. Deeper milling (3 inches) will be performed in proximity to the intersections.
Special attention will be made to potential opportunities to improve drainage for the northwest
corner of the intersection. This improvement may decrease the potential number of rear-end
crashes in wet or icy roadway conditions.
• Pavement Markings – Markings will be refreshed as part of the remilling project. Consideration
will be made to adding dotted lane line extensions for the exclusive turn lanes on all approaches
to the intersection to provide additional definition for drivers. Center lines will be added to mark
lanes on White Bagley Road and Breakneck Hill Road. This enhancement will assist in the
reduction of nighttime and sideswipe crashes. Further discussion associated with the benefits of
retroreflective and enhanced pavement markings is available within The Benefits of Pavement
Markings: A Renewed Perspective Based on Recent and Ongoing Research, a paper readily
available on the Federal Highway Administrations website. Contained within the study are
specific references to nighttime, sideswipe, and lane departure crashes and their association with
pavement markings.
• Narrow Lanes- As design plans progress, consideration will be made regarding the most efficient
lane widths with consideration to safety, for the intersection approaches.
• Vegetation – Maintain the large trees lining Route 9 on the south side, west of the intersection in
order to reduce the shadows cast over the eastbound approach lanes to the intersection. This
maintenance will potentially assist in the reduction of rear-end crashes on this approach due to
increase visibility.
• Median Conditions – Repair/replace the eastbound median impact attenuator to reestablish a safer
median.
• Signal Equipment –Retroreflective backplates should be replaced on the Route 9 signals and
should be added to the White Bagley Road and Breakneck Hill Road signals in order to further
visibility of the signal heads and potentially decrease rear-end crashes.
Install additional signal heads on the span wire poles to provide additional visibility to drivers.
This will potentially allow drivers to see the signal display when following closely behind a large
truck. In addition this display could increase visibility with regard to the rolling terrain and
vertical curvature along Route 9.
Page 18
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
• Clearance Intervals – Yellow and red clearance times need to be confirmed by MassDOT District
3 to determine if they are set to the current standards. In addition, it should be considered if the
clearance times are set for the posted roadway speed limit of 50 mph or perhaps adjusted to
accommodate the actual 85th percentile speeds on Route 9. This potential adjustment will directly
relate to the occurrence of red light running, as well as rear-end type crashes.
• Bicycle Accommodations – Enhanced bicycle accommodations will be considered as part of the
remilling project, both along Route 9 and at the intersection along White Bagley Road and
Breakneck Hill Road. Discussions with MassDOT have and will continue to address how to
approach these accommodations safely. Route 9 does not restrict pedestrians or bicycles within
the right-of-way and therefore accommodations need to be considered, and provided if deemed
appropriate. These accommodations could include bicycle boxes at the intersection, bicycle lane
pavement markings or sharrows, and associated signage.
• Pedestrian Accommodations – As part of the MassDOT project design submission, the feasibility
of constructing a section of new sidewalk and associated wheelchair ramps along the eastbound
side of Route 9 from Breakneck Hill Road to the beginning of the existing sidewalk at Woodland
Road, a distance of approximately 3,700 feet away will be studied.
Signage – Install street signs for White Bagley Road and Breakneck Hill Road on the overhead
span wire pole for both eastbound and westbound approaches of Route 9. This improved signage
will potentially reduce the occurrence of rear-end and sideswipe crashes as motorists unfamiliar
with the area will be less likely to have to make quick turn decisions at the
intersection.
Install “LEFT TURN ON GREEN ARROW ONLY” (R10-5) in westbound direction along Route 9 to mirror the signage provided in the
eastbound direction. This signage will inform motorists that the left-turn is
protected and not permissive and may decrease the occurrence of angle
crashes.
Install “Advance Street Name Sign” (D3-2) in the eastbound direction
along Route 9 for White Bagley Road. Consider adding directionality/lane use so decision for
which lane to be in can be made well in advance of the intersection. This improved signage will
potentially reduce the occurrence of rear-end and sideswipe crashes as motorists unfamiliar with
the area will be less likely to have to make quick turn decisions at the intersection.
Install “Advance Intersection Lane Control” (R3-8 series) signage along Route 9 in both
directions, advising drivers of the oncoming lane uses. This improved signage will potentially
reduce the occurrence of rear-end and sideswipe crashes as motorists unfamiliar with the area will
be less likely to have to make quick turn decisions at the intersection.
Install “KEEP RIGHT” (R4-7) signage to advise drivers of the medians along Route 9. This may assist in avoiding crashes into the median impact
attenuator.
Page 19
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Summary of Road Safety Audit
Based on observations and discussions, the RSA team identified the issues and possible enhancements
that could improve safety at the intersections of Route 9 (Turnpike Road) at White Bagley Road/
Breakneck Hill Road and Route 9 (Turnpike Road) at Central Street/ Oak Hill Road in Southborough,
Massachusetts. Many of the enhancements identified will be studied to determine feasibility as part of the
design process for the MassDOT micromilling project along Route 9.
Tables 2 and 3 summarize these safety issues, possible enhancements, estimated safety payoff, time
frame, cost, and responsible agency for Route 9 at Central Street/ Oak Hill Road and Route 9 at White
Bagley Road/ Breakneck Hill Road, respectively. Safety payoff estimates are subjective and based on
engineering judgment and are categorized as low, medium, and high. The time frame is categorized as
short-term (<1 year), mid-term (1 to 3 years), or long-term (>3 years). The costs are categorized as low
(<$10,000), medium ($10,001 to $50,000), or high (>$50,001).
Page 20
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 2. Potential Safety Enhancement Summary – Route 9 at Central Street/ Oak Hill Road
Safety
Payoff
Time
Frame
Cost
Responsible
Agency
Low
Long-term
High
MassDOT
Pavement Markings
Markings will be refreshed as part of the micromilling project.
Consideration will be made to adding dotted lane line
Medium
extensions for the exclusive turn lanes on all approaches to
the intersection to provide additional definition for drivers.
Long-term
High
MassDOT
Lane Geometry –
Markings
Provide two delineated approach lanes on Central Street
southbound approach. There is currently about 33 feet of
roadway right-of-way width available to accommodate the
proposed lanes. The existing double yellow center line
would need to be removed and replaced during the remilling
project to allow the for three 11 foot lanes composed of one
shared through/right-turn lane, one 11 foot left-turn lane and
one 11 foot departure/receiving lane.
Medium
Long-term
High
MassDOT
Lane Geometry –
Utility Poles
Relocate two utility poles on the eastern edge of Oak Hill
Road, along the frontage of the Mobil station to allow for the
extension of the northbound exclusive right-turn lane on Oak
Hill Road.
Low
Long-term
High
Town of
Southborough
Lane Geometry –
Narrow Lanes
As design plans progress, consideration will be made
regarding the most efficient lane widths with consideration to
safety, for the intersection approaches.
Low
Long-term
Low
MassDOT
Signal Equipment –
Opticom
Shift opticom receiver slightly west (right) in order to be
better aligned with oncoming emergency vehicles.
Medium
Short-term
Low
Town of
Southborough
Signal Equipment
Install additional signal heads on the mast arms to provide
additional visibility to drivers. Structural evaluation of existing
span wire to be completed prior to addition of any
equipment. Replace existing backplates with retroreflective
backplates.
High
Long-term
High
MassDOT
Safety Issue
Potential Safety Enhancement
Pavement will be replaced as part of the micromilling
Pavement Conditions project, improving rutting issues. Deeper milling (3 inches)
will be performed in proximity to the intersections.
Page 21
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 2. Potential Safety Enhancement Summary – Route 9 at Central Street/ Oak Hill Road
Safety
Payoff
Time
Frame
Cost
Responsible
Agency
High
Short-term
Low
MassDOT
Medium
Short-term
Low
Town of
Southborough
Low
Long-term
High
MassDOT
Install “CROSS ONLY ON (symbolic walk indication)
Signage - Pedestrian SIGNAL” (R10-2) signage on all corners of the intersection.
Accommodations
Upgrade to current ADA standards with pedestrian heads
with countdown display and new pedestrian call buttons.
Medium
Long-term
Medium
MassDOT
Signage
Install street signs for Oak Hill Road and Central Street on
the overhead mast arms for both eastbound and westbound
approaches of Route 9.
Medium
Mid-term
Low
MassDOT
Signage
Install “LEFT TURN YIELD ON GREEN” (R10-12) sign on
the mast arm for the Central Street southbound approach to
the intersection.
Medium
Long-term
High
MassDOT
Signage
Install “Advance Intersection Lane Control” variation (R3-8b)
on the Oak Hill Road approach to the intersection.
Medium
Mid-term
Low
MassDOT
Study the potential of lengthening the westbound left-turn
Access Management lane storage, while considering the balance with the left-turn
lane storage for eastbound Route 9 at the signal.
Medium
Long-term
High
MassDOT
Safety Issue
Potential Safety Enhancement
Signal Timing –
Clearance Intervals
Confirm yellow and red clearance times are set to the
current standards. Consider if the clearance times are set for
the posted roadway speed limit of 45 mph or perhaps
th
adjusted to accommodate the actual 85 percentile speeds
on Route 9.
Sight Distance –
Vegetation
Cut back the overgrown vegetation along Oak Hill Road
along the currently unoccupied site directly to the north of
the Walgreens driveway.
Bicycle
Accommodations
Enhance bicycle accommodations, both along Route 9 and
at the intersection along Central Street and Oak Hill Road.
Discussions with MassDOT have and will continue to
address how to approach these accommodations safely.
These accommodations could include bicycle boxes at the
intersection, bicycle lane pavement markings or sharrows,
and associated signage.
Page 22
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 2. Potential Safety Enhancement Summary – Route 9 at Central Street/ Oak Hill Road
Safety Issue
Potential Safety Enhancement
Add pavement markings in the eastbound direction on
Access Management
Route 9 associated with blocking the intersection at
–Pavement Markings
Woodland Road.
Install signage listing fines associated with blocking the
Access Management
intersection, mounted under the existing “DO NOT BLOCK
- Signage
INTERSECTION” sign.
Safety
Payoff
Time
Frame
Cost
Responsible
Agency
Medium
Mid-term
Medium
MassDOT
Low
Mid-term
Low
MassDOT
Page 23
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 3. Potential Safety Enhancement Summary – Route 9 at White Bagley Road/ Breakneck Hill Road
Safety
Payoff
Time
Frame
Cost
Responsible
Agency
Low
Long-term
High
MassDOT
Pavement Markings
Markings will be refreshed as part of the remilling project.
Consideration will be made to adding dotted lane line
extensions for the exclusive turn lanes on all approaches to
the intersection to provide additional definition for drivers.
Center lines will be added to mark lanes on White Bagley
Road and Breakneck Hill Road.
Medium
Long-term
High
MassDOT
Lane Geometry –
Narrow Lanes
As design plans progress, consideration will be made
regarding the most efficient lane widths with consideration to
safety, for the intersection approaches.
Low
Long-term
Low
MassDOT
Maintenance –
Vegetation
Maintain the large trees lining Route 9 on the south side, west
of the intersection in order to reduce the shadows cast over
the eastbound approach lanes.
Low
Mid-term
Medium
Town of
Southborough
Median Replacement
Repair/replace the eastbound median impact attenuator.
Medium
Mid-term
Medium
MassDOT
Signal Equipment
Replace backplates on the Route 9 signals. Add backplates to
the White Bagley Road and Breakneck Hill Road signals.
Structural evaluation of existing span wire to be completed
prior to addition of any equipment.
Medium
Mid-term
Low
MassDOT
Signal Equipment
Install additional signal heads on the span wire poles to
provide additional visibility to drivers. Structural evaluation of
existing span wire to be completed prior to addition of any
equipment.
Medium
Long-term
High
MassDOT
Signal Timing –
Clearance Intervals
Confirm yellow and red clearance times are set to the current
standards. Consider if the clearance times are set for the
posted roadway speed limit of 50 mph or perhaps adjusted to
th
accommodate the actual 85 percentile speeds on Route 9.
High
Short-term
Low
MassDOT
Safety Issue
Potential Safety Enhancement
Pavement Conditions
Pavement will be replaced as part of the remilling project,
improving rutting issues. Deeper milling (3 inches) will be
performed in proximity to the intersections. Special attention
will be made to potential opportunities to improve drainage for
the northwest corner of the intersection.
Page 24
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Table 3. Potential Safety Enhancement Summary – Route 9 at White Bagley Road/ Breakneck Hill Road
Safety
Payoff
Time
Frame
Cost
Responsible
Agency
Low
Long-term
High
MassDOT
Pedestrian
Accommodations
Construct a section of new sidewalk and associated
wheelchair ramps along the eastbound side of Route 9 from
Breakneck Hill Road to the beginning of the existing sidewalk
at Woodland Road, a distance of approximately 3,700 feet
away.
Medium
Mid-term
High
MassDOT
Signage
Install street signs for White Bagley Road and Breakneck Hill
Road on the overhead span wire poles for both eastbound
and westbound approaches of Route 9.
Medium
Mid-term
Low
MassDOT
Signage
Install “LEFT TURN ON GREEN ARROW ONLY” (R10-5) in
westbound direction along Route 9 to mirror the signage
provided in the eastbound direction.
Medium
Mid-term
Low
MassDOT
Signage
Install “Advance Street Name Sign” (D3-2) in the eastbound
direction along Route 9 for White Bagley Road. Consider
adding directionality/lane use so decision for which lane to be
in can be made well in advance of the intersection.
Medium
Mid-term
Low
MassDOT
Signage
Install “Advance Intersection Lane Control” (R3-8 series)
signage along Route 9 in both directions.
Medium
Mid-term
Low
MassDOT
Signage
Install “KEEP RIGHT” (R4-7) signage on medians on Route 9.
Low
Mid-term
Low
MassDOT
Safety Issue
Potential Safety Enhancement
Enhance bicycle accommodations, both along Route 9 and at
the intersection along White Bagley Road and Breakneck Hill
Road. Discussions with MassDOT have and will continue to
Bicycle Accommodations address how to approach these accommodations safely.
These accommodations could include bicycle boxes at the
intersection, bicycle lane pavement markings or sharrows, and
associated signage.
Page 25
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Appendix A. RSA Meeting Agenda
Road Safety Audit
Southborough – Turnpike Road (Route 9) at
Central Street/ Oak Hill Road and
White Bagley Road/ Breakneck Hill Road
Meeting Location: Southborough Department of Public Works
147 Cordaville Road
Tuesday, March 4th
1:00 PM – 3:30 PM
Type of meeting:
High Crash Locations – Road Safety Audit
Attendees:
Invited Participants to Comprise a Multidisciplinary Team
Please bring:
Thoughts and Enthusiasm!!
1:00 PM
Welcome and Introductions
1:15 PM
Review of Site Specific Material
• Crash, Speed & Volume Summaries– provided in advance
• Existing Geometries and Conditions
2:00 PM
Visit the Site
• Drive to Route 9 at White Bagley Road/ Breakneck Hill Road and Route 9 at
Central Street/ Oak Hill Road
• As a group, identify areas for improvement
3:00 PM
Post Visit Discussion / Completion of RSA
• Discuss observations and finalize findings
• Discuss potential improvements and finalize recommendations
3:30 PM
Adjourn for the Day – but the RSA has not ended
Instructions for Participants:
• Before attending the RSA on Tuesday, March 4th, participants are encouraged to
drive through the intersection and complete/consider elements on the RSA Prompt
List with a focus on safety.
• All participants will be actively involved in the process throughout. Participants
are encouraged to come with thoughts and ideas, but are reminded that the
synergy that develops and respect for others’ opinions are key elements to the
success of the overall RSA process.
• After the RSA meeting, participants will be asked to comment and respond to the
document materials to assure it is reflective of the RSA completed by the
multidisciplinary team.
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Appendix B. RSA Audit Team Contact List
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Participating Audit Team Members
Date:
March 4, 2014
Location:
Audit Team Members Agency/Affiliation
Southborough DPW 147 Cordaville Road
Email Address
Phone Number
Mark Abbott
Central Transportation
Planning Staff
mabbott@ctps.org
617-973-7095
Jennifer Burney
Town of Southborough –
Town Planner
jburney@southboroughma.com
508-485-0710
ext. 3028
Alolade Campbell
MassDOT – District 3
alolade.campbell@state.ma.us
508-929-3887
Chris DeMoranville
Town of Southborough DPW
cdemoranville@southboroughma.com
– Staff Engineer
508-485-1210
Karen Galligan
Town of Southborough DPW
kgalligan@southboroughma.com
– Superintendent
508-485-1210
Richard Handfield
MassDOT – District 3
richard.handfield@state.ma.us
508-929-3864
Lieutenant Sean
James
Police Department – Town of
sjames@southboroughma.com
Southborough
508-485-2121
Chief Joe Mauro
Fire Department - Town of
Southborough – Fire Chief
jmauro@southboroughma.com
508-485-3235
Corey O’Connor
MassDOT – Highway
Division – Safety Section
corey.oconnor@state.ma.us
857-368-9638
Hud Quistorff
MassDOT – District 3
hud.quistorff@state.ma.us
508-929-3857
Lisa Schletzbaum
MassDOT – Highway
Division – Safety Section
lisa.schletzbaum@state.ma.us
857-368-9634
John Osorio
Greenman-Pedersen, Inc.
josorio@gpinet.com
978-570-2973
Erica Guidoboni
Greenman-Pedersen, Inc.
eguidoboni@gpinet.com
978-570-2942
Road Safety Audit—Route 9 at Central Street/Oak Hill Road and White Bagley Road/Breakneck Hill Road
Prepared by Greenman-Pedersen, Inc.
Appendix C. Detailed Crash Data
CRASH RATE WORKSHEET
CITY/TOWN : Southborough
DISTRICT :
3
COUNT DATE : 9/24/2013
UNSIGNALIZED :
SIGNALIZED :
X
MassDOT USE ONLY
Source #
~ INTERSECTION DATA ~
MAJOR STREET : Route 9 (Turnpike Road)
RIN #
MINOR STREET(S) : Oak Hill Road
RIN #
Central Street
RIN #
RIN #
RIN #
Central Street
INTERSECTION
North
DIAGRAM
INTERSECTION
Route 9
(Label Approaches)
REF #
Route 9
Oak Hill Road
Peak Hour Volumes
APPROACH :
1
2
3
4
DIRECTION :
NB
SB
EB
WB
VOLUMES (PM) :
288
259
1724
2719
" K " FACTOR :
0.09
TOTAL # OF
ACCIDENTS :
CRASH RATE CALCULATION :
76
APPROACH ADT :
# OF
YEARS :
0.75
5
RATE =
5
6
55444.44 ADT = TOTAL VOL/"K" FACT.
AVERAGE # OF
ACCIDENTS ( A ) :
15.20
( A * 1,000,000 )
( ADT * 365 )
Source (optional):
Comments:
last updated: 11/06/01
CRASH RATE WORKSHEET
CITY/TOWN : Southborough
DISTRICT :
3
COUNT DATE : 9/24/2013
UNSIGNALIZED :
SIGNALIZED :
X
MassDOT USE ONLY
Source #
~ INTERSECTION DATA ~
MAJOR STREET : Route 9 (Turnpike Road)
RIN #
MINOR STREET(S) : White Bagley Road
RIN #
Breakneck Hill Road
RIN #
RIN #
RIN #
White Bagley Road
INTERSECTION
North
DIAGRAM
INTERSECTION
Route 9
(Label Approaches)
REF #
Route 9
Breakneck Hill Road
Peak Hour Volumes
APPROACH :
1
2
3
4
DIRECTION :
NB
SB
EB
WB
VOLUMES (PM) :
122
96
1989
2536
" K " FACTOR :
0.09
TOTAL # OF
ACCIDENTS :
CRASH RATE CALCULATION :
43
APPROACH ADT :
# OF
YEARS :
0.45
5
RATE =
52700
5
6
ADT = TOTAL VOL/"K" FACT.
AVERAGE # OF
ACCIDENTS ( A ) :
8.60
( A * 1,000,000 )
( ADT * 365 )
Source (optional):
Comments:
last updated: 11/06/01
White Bagley Road at Breakneck Road
#
Crash Date
Raw Crash Data
Crash Day Time of Day
Manner of Collision
Light Condition
Weather Condition
Local Crash Data (2010-2012)
Road Surface
1 3/1/2010
2 6/14/2010
3 8/19/2010
Monday
Monday
Thursday
12:05
17:20
13:15
Rear-end
Rear-end
Rear-end
Daylight
Daylight
Daylight
Cloudy
Clear
Clear
Dry
Dry
Dry
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Monday
Wednesday
Thursday
Sunday
Tuesday
Tuesday
Sunday
Thursday
Wednesday
Thursday
Monday
Friday
Friday
Friday
Saturday
11:40
9:05
13:49
12:23
15:42
16:35
17:40
7:55
21:49
9:56
10:16
14:45
17:31
8:10
20:41
Angle
Rear-end
Rear-end
Rear-end
Rear-end
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Rear-end
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Single vehicle crash
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Dark - lighted roadway
Daylight
Daylight
Daylight
Daylight
Daylight
Dark - lighted roadway
Rain
Clear
Clear
Snow
Cloudy
Clear
Clear
Cloudy
Clear
Cloudy
Clear
Clear
Clear
Clear
Snow
Wet
Dry
Dry
Wet
Dry
Dry
Dry
Wet
Dry
Dry
Dry
Dry
Dry
Dry
Snow
Monday
Monday
17:30
8:35
Rear-end
Angle
8/23/2010
10/20/2010
12/2/2010
12/26/2010
5/10/2011
6/7/2011
7/10/2011
9/29/2011
10/5/2011
1/26/2012
3/12/2012
4/20/2012
7/13/2012
7/20/2012
12/29/2012
Driver Contributing Code
Followed too closely
No Improper Driving
Followed too closely
Disregarded traffic signs,
signals, road markings
Followed too closely
Other improper action
Followed too closely
Inattention
Failed to yield right of way
Inattention
Inattention
Physical Impairment
Other improper action
Failed to yield right of way
Failed to yield right of way
Followed too closely
Followed too closely
No Improper Driving
Ages
50
50
54
30
40
75
78
32
19
27
29
59
34
48
16
38
47
17
32
31
22
72
68
58
29
31
28
18
32
76
47
38
29
39
62
38
23
26
Additional MassDOT Crash Data (2008-2011)
21
22
23
24
25
26
27
28
2/8/2008
4/4/2008
6/17/2008
7/22/2008
7/29/2008
8/11/2008
11/11/2008
12/12/2008
Friday
Friday
Tuesday
Tuesday
Tuesday
Monday
Tuesday
Friday
11:01
14:40
9:07
4:45
9:38
22:40
11:00
18:54
Sideswipe, same direction
Sideswipe, same direction
Sideswipe, same direction
Sideswipe, same direction
Rear-end
Single vehicle crash
Rear-end
Rear-end
Cloudy/Cloudy
Cloudy/Cloudy
Snow/Sleet, hail (freezing rain
or drizzle)
Cloudy/Rain
Clear/Clear
Clear
Clear/Clear
Clear/Clear
Clear/Clear
Cloudy/Cloudy
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
1/8/2009
4/20/2009
5/5/2009
5/5/2009
7/13/2009
7/20/2009
8/7/2009
8/10/2009
8/30/2009
9/14/2009
9/28/2009
10/26/2009
11/30/2009
4/11/2010
3/24/2011
Thursday
Monday
Tuesday
Tuesday
Monday
Monday
Friday
Monday
Sunday
Monday
Monday
Monday
Monday
Sunday
Thursday
16:15
9:00
22:06
22:20
16:02
7:30
10:27
14:35
14:22
13:52
16:30
9:55
15:35
19:20
16:00
Angle
Rear-end
Rear-end
Single vehicle crash
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Cloudy/Cloudy
Clear/Clear
Cloudy/Rain
Cloudy/Cloudy
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Rain/Cloudy
Clear/Clear
Clear/Clear
19 1/7/2008
20 1/28/2008
Dry
Dry
Wet
Wet
Dry
Dry
Dry
Dry
Dry
Dry
Sand, mud, dirt, oil,
gravel
Dry
Wet
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Wet
Dry
Dry
White Bagley Road/Breakneck Road
Crash Data Summary Charts
Route 9 at White Bagley Road/ Breakneck Hill Road, Southborough, MA
Crash Month
20%
16%
14%
15%
10%
9%
9%
9%
7%
7%
7%
7%
7%
5%
5%
2%
0%
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
Crash Day of Week
40%
35%
30%
25%
20%
15%
10%
5%
0%
35%
19%
16%
14%
9%
5%
Monday
Tuesday
2%
Wednesday
Thursday
Saturday
Friday
Sunday
Crash Time of Day
25%
21%
19%
20%
14%
15%
12%
12%
10%
5%
7%
5%
5%
5%
2%
0%
6AM8AM
8AM10AM
10AM12PM
12PM- 2PM-4PM4PM-6PM6PM-8PM 8PM2PM
10PM
10PM12AM
0%
0%
12AM2AM
2AM4AM
4AM6AM
Crash Manner of Collision
80%
70%
60%
50%
40%
30%
20%
10%
0%
72%
7%
Single Vehicle
Crash
7%
Rear-end
Angle
Town of Southborough and MassDOT data (2008-2012)
14%
0%
Sideswipe,
Sideswipe,
same direction opposite
direction
0%
0%
0%
Head-on
Rear-to-Rear
Unknown
March 2014
Crash Data Summary Charts
Route 9 at White Bagley Road/ Breakneck Hill Road, Southborough, MA
Crash Light Condition
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
89%
11%
Daylight
0%
0%
0%
Dawn
Dusk
Dark - Lighted
Dark Roadway not
Roadway
lighted
* Local Town of Southborough Crashes only - MassDOT crashes did not provide this information
0%
0%
0%
Dark Roadway
lighting
unknown
Other
Unknown
Crash Weather Condition
70%
63%
60%
50%
40%
30%
21%
20%
9%
10%
5%
2%
0%
0%
Clear
Cloudy
Rain
Snow
0%
0%
Sleet, Hail, Fog, Smog, Severe
Blowing
Freezing
Smoke Crosswinds sand, snow
Rain
0%
0%
Other
Unknown
Crash Road Surface
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
79%
16%
Dry
Wet
2%
0%
2%
0%
0%
0%
0%
Snow
Ice
Sand, mud,
dirt, oil,
gravel
Water
(standing,
moving)
Slush
Other
Unknown
Crash Driver Ages*
70%
61%
60%
50%
44%
40%
30%
22%
22%
28%
20%
22%
11%
10%
0%
0%
15-20
21-29
30-39
40-49
50-59
* Local Town of Southborough Crashes only - MassDOT crashes did not provide this information
Town of Southborough and MassDOT data (2008-2012)
60-69
70-79
80+
March 2014
Oak Hill Road at Central Street
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Crash Date
Crash Day
Raw Crash Data
Time of Day
Manner of Collision
Light Condition
Weather Condition
Local Crash Data (2010-2012)
2/26/2010
2/27/2010
4/23/2010
4/28/2010
6/10/2010
6/10/2010
7/20/2010
8/3/2010
8/12/2010
9/10/2010
10/13/2010
12/3/2010
12/6/2010
12/9/2010
12/16/2010
12/22/2010
12/22/2010
2/24/2011
4/8/2011
4/15/2011
6/28/2011
8/15/2011
9/16/2011
10/7/2011
11/22/2011
Friday
Saturday
Friday
Wednesday
Thursday
Thursday
Tuesday
Tuesday
Thursday
Friday
Wednesday
Friday
Monday
Thursday
Thursday
Wednesday
Wednesday
Thursday
Friday
Friday
Tuesday
Monday
Friday
Friday
Tuesday
6:45
20:15
17:00
12:56
7:03
7:14
8:20
16:45
10:07
9:56
22:40
17:40
7:40
18:22
9:20
14:40
22:41
17:23
11:00
15:16
15:40
17:14
12:56
12:09
18:00
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Angle
Rear-end
Rear-end
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Rear-end
Angle
Rear-end
Angle
Single Vehicle Crash
Angle
Unknown
Sideswipe, same direction
Rear-end
Rear-end
Angle
Rear-end
Rear-end
Dawn
Dark - lighted roadway
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Dark - lighted roadway
Daylight
Daylight
Daylight
Daylight
Daylight
Dark - lighted roadway
Dusk
Daylight
Daylight
Daylight
Dusk
Daylight
Daylight
Dark - lighted roadway
26 12/15/2011
27 12/28/2011
28 1/19/2012
Thursday
Wednesday
Thursday
17:11
16:58
23:08
Angle
Angle
Angle
Dark - lighted roadway
Dark - lighted roadway
Dark - lighted roadway
29
30
31
32
33
34
Thursday
Wednesday
Thursday
Thursday
Saturday
Tuesday
17:45
10:39
21:24
18:02
18:15
14:03
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
35 7/16/2012
36 9/10/2012
Monday
Monday
17:13
16:30
37
38
39
40
41
42
Tuesday
Wednesday
Monday
Monday
Monday
Wednesday
17:40
19:51
9:22
15:33
9:04
18:56
1/26/2012
2/8/2012
3/8/2012
4/12/2012
5/5/2012
5/29/2012
9/11/2012
9/12/2012
9/17/2012
11/12/2012
11/26/2012
12/12/2012
Sleet, Hail,
Freezing Rain
Clear
Clear
Rain
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Snow
Cloudy
Clear
Clear
Clear
Clear
Rain
Clear
Clear
Clear
Road Surface
Wet
Dry
Dry
Wet
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Wet
Snow
Dry
Dry
Dry
Dry
Wet
Dry
Dry
Dry
Wet
Dry
Snow
Dark - lighted roadway
Daylight
Dark - lighted roadway
Daylight
Daylight
Daylight
Rain
Clear
Snow
Sleet, Hail,
Freezing Rain
Clear
Clear
Clear
Clear
Clear
Angle
Sideswipe, same direction
Daylight
Daylight
Clear
Clear
Dry
Dry
Sideswipe, same direction
Angle
Rear-end
Rear-end
Rear-end
Rear-end
Daylight
Dark - lighted roadway
Daylight
Daylight
Daylight
Dark - lighted roadway
Clear
Clear
Clear
Clear
Clear
Clear
Dry
Dry
Dry
Dry
Dry
Dry
Wet
Dry
Dry
Dry
Dry
Dry
Driver Contributing Code
Followed too closely
Wrong side or wrong way
Inattention
Followed too closely
Made an improper turn
Glare
Followed too closely
Inattention
Followed too closely
Inattention
Inattention
Followed too closely
Failed to yield right of way
Failed to yield right of way
Driving too fast for conditions
Failed to yield right of way
Made an improper turn
Inattention
Inattention
Distracted
Other improper action
Distracted
Distracted
Disregarded traffic sign,
signals, road markings
Unknown
Driving too fast for conditions
Failed to yield right of way
Followed too closely
No Improper Driving
Other improper action
Failed to yield right of way
Followed too closely
Failed to keep in proper lane
or running off road
Inattention
Failed to keep in proper lane
or running off road
Failed to yield right of way
Followed too closely
Followed too closely
Followed too closely
Followed too closely
Ages
47
38
65
52
48
30
25
28
45
24
36
48
25
40
32
26
25
18
55
42
52
40
31
46
46
31
39
49
26
38
44
51
54
45
34
26
60
43
46
39
72
29
55
23
79
66
32
23
34
68
40
45
50
40
31
45
36
39
28
42
27
19
39
16
35
35
41
26
55
27
46
30
45
58
60
47
49
43
53
23
40
40
36
38
39
32
Oak Hill Road/Central Street
Oak Hill Road at Central Street
Raw Crash Data
Additional MassDOT Crash Data (2008-2011)
43
1/29/2008
Tuesday
14:09
Rear-end
Cloudy/Cloudy
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
2/14/2008
5/13/2008
5/23/2008
6/9/2008
6/9/2008
6/30/2008
7/9/2008
7/10/2008
7/29/2008
8/10/2008
8/20/2008
10/28/2008
12/5/2008
12/31/2008
1/12/2009
1/28/2009
2/8/2009
2/9/2009
2/13/2009
2/25/2009
2/27/2009
3/4/2009
3/4/2009
3/6/2009
3/8/2009
4/3/2009
4/8/2009
8/21/2009
10/24/2009
12/4/2009
10/18/2010
2/3/2011
3/27/2011
Thursday
Tuesday
Friday
Monday
Monday
Monday
Wednesday
Thursday
Tuesday
Sunday
Wednesday
Tuesday
Friday
Wednesday
Monday
Wednesday
Sunday
Monday
Friday
Wednesday
Friday
Wednesday
Wednesday
Friday
Sunday
Friday
Wednesday
Friday
Saturday
Friday
Monday
Thursday
Sunday
9:05
18:00
8:20
9:05
9:05
10:00
15:43
6:57
9:29
14:45
7:45
14:45
22:30
15:45
16:15
10:00
6:45
13:39
22:03
10:19
19:35
21:40
13:34
13:57
13:07
15:25
16:25
17:30
22:01
11:10
17:15
11:07
11:15
Rear-end
Rear-end
Sideswipe, same direction
Rear-end
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Single vehicle crash
Rear-end
Angle
Angle
Angle
Sideswipe, opposite direction
Angle
Angle
Sideswipe, same direction
Rear-end
Single vehicle crash
Rear-end
Rear-end
Rear-end
Angle
Rear-end
Rear-end
Rear-end
Sideswipe, same direction
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Rear-end
Clear/Clear
Clear/Clear
Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Clear/Clear
Cloudy/Clear
Clear/Clear
Snow/Snow
Clear/Clear
Snow/Snow
Clear
Clear/Clear
Clear/Clear
Cloudy/Cloudy
Rain/Cloudy
Clear/Clear
Cloudy/Cloudy
Clear/Clear
Clear/Clear
Cloudy/Cloudy
Clear/Clear
Clear
Rain/Rain
Cloudy/Cloudy
Clear
Clear/Rain
Clear/Clear
Dry
Water (standing,
moving)
Dry
Not reported
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Dry
Snow
Dry
Snow
Dry
Dry
Dry
Dry
Wet
Dry
Dry
Dry
Dry
Wet
Dry
Dry
Wet
Dry
Dry
Wet
Dry
Oak Hill Road/Central Street
Crash Data Summary Charts
Route 9 at Central Street/ Oak Hill Road, Southborough, MA
Crash Month
20%
10%
16%
14%
15%
8%
7%
9%
8%
5%
8%
7%
5%
8%
7%
4%
0%
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
Crash Day of Week
25%
21%
20%
21%
18%
17%
13%
15%
10%
5%
4%
5%
0%
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Crash Time of Day
30%
26%
25%
20%
15%
10%
12%
10%
14%
12%
7%
7%
5%
5%
7%
0%
6AM8AM
8AM10AM
10AM12PM
12PM- 2PM-4PM 4PM-6PM 6PM-8PM 8PM2PM
10PM
10PM12AM
0%
0%
0%
12AM2AM
2AM4AM
4AM6AM
Crash Manner of Collision
70%
60%
50%
40%
30%
20%
10%
0%
61%
21%
12%
4%
Single Vehicle
Crash
Rear-end
Angle
Town of Southborough and MassDOT data (2008-2012)
Sideswipe,
same direction
1%
0%
0%
1%
Sideswipe,
opposite
direction
Head-on
Rear-to-Rear
Unknown
March 2014
Crash Data Summary Charts
Route 9 at Central Street/ Oak Hill Road, Southborough, MA
Crash Light Condition*
70%
67%
60%
50%
40%
26%
30%
20%
2%
5%
Dawn
Dusk
10%
0%
0%
Daylight
Dark - Lighted
Dark Roadway
Roadway not
lighted
* Local Town of Southborough Crashes only - MassDOT crashes did not provide this information
0%
0%
0%
Dark Roadway
lighting
unknown
Other
Unknown
Crash Weather Condition
80%
75%
70%
60%
50%
40%
30%
20%
9%
10%
8%
5%
3%
0%
0%
Clear
Cloudy
Rain
Snow
0%
0%
Sleet, Hail, Fog, Smog, Severe
Blowing
Freezing
Smoke Crosswinds sand, snow
Rain
0%
0%
Other
Unknown
Crash Road Surface
90%
80%
79%
70%
60%
50%
40%
30%
20%
13%
10%
5%
0%
Dry
Wet
Snow
0%
0%
1%
0%
0%
1%
Ice
Sand, mud,
dirt, oil,
gravel
Water
(standing,
moving)
Slush
Other
Unknown
Crash Driver Ages*
70%
64%
60%
55%
50%
38%
40%
30%
24%
20%
10%
12%
7%
5%
0%
15-20
21-29
30-39
40-49
50-59
60-69
70-79
0%
80+
* Local Town of Southborough Crashes only - MassDOT crashes did not provide this information
Town of Southborough and MassDOT data (2008-2012)
March 2014