ROAD SAFETY AUDIT
Route 20 (East Main Street/Boston Post Road)
at Concord Road
City of Marlborough
April 2015
Prepared For:
MassDOT
Prepared By:
McMahon Associates, Inc.
300 Myles Standish Blvd. Suite 201
Taunton, MA 02780
Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Table of Contents
Background ................................................................................................................................. 1
Project Data ................................................................................................................................. 1
Project Location and Description .............................................................................................. 2
Road Safety Audit Observations and Potential Improvements .............................................. 5
Recommendations ..................................................................................................................... 10
List of Appendices
Appendix A.
Appendix B.
Appendix C.
RSA Meeting Agenda
RSA Audit Team Contact List
Detailed Crash Data
List of Figures
Figure 1: Location Map ............................................................................................................................. 4
List of Tables
Table 1.
Table 2.
Table 3.
Participating Audit Team Members ....................................................................................... 1
Estimated Time Frame and Costs Breakdown ..................................................................... 10
Potential Safety Enhancement Summary ............................................................................. 11
Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Background
The Federal Highway Administration (FHWA) 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. This RSA evaluates the intersection of Route 20 (East Main
Street/Boston Post Road) at Concord Road in Marlborough, MA, as shown in Figure 1.
A safety audit was scheduled for this intersection as part of an intersection and signal improvement
project and as required by the MassDOT design process. The intersection of Route 20 (East Main
Street/Boston Post Road) with Concord Road was identified as a High Crash Location within the Boston
Region by the Metropolitan Area Planning Council (MAPC). Directly to the west of the study area
intersection, Route 20 intersects with Curtis Avenue and Hosmer Street. These intersections have also
been identified as two separate crash clusters that extend from the west of Curtis Avenue to the east of
Hosmer Street.
A key objective of the RSA is to identify both short-term and long-term safety improvements that can be
made at the subject intersection.
Project Data
A Road Safety Audit was completed for the intersection of Route 20 (East Main Street/Boston Post Road)
at Concord Road in the City of Marlborough on April 21, 2015. The agenda for the RSA meeting held at
Marlborough Department of Public Works (DPW) is provided in Appendix A of this report. As shown
below in Table 1, the audit team consisted of a multidisciplinary team with representatives from state,
regional and local agencies providing expertise in the engineering, planning, maintenance and emergency
response fields. Contact information for the RSA attendees is provided in Appendix B of this report.
Table 1. Participating Audit Team Members
Audit Team Member
Agency/Affiliation
John Mastera
MassDOT Traffic Safety
William Ullom
MassDOT Traffic Safety
Lola Campbell
MassDOT – District 3 Traffic
Joe Frawley
MassDOT – District 3 Traffic
Sarah Kurpiel Lee
MAPC
Timothy Collins
City of Marlborough DPW
Evan Pilachowski
City of Marlborough DPW
Tim Naze
City of Marlborough Fire Department
John McGrath
City of Marlborough Police Department
Brian Brosnan
Vanasse Hangen Brustlin (VHB)
Phil Viveiros
McMahon Associates
Alexander Lacouture
McMahon Associates
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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Within the email invitation sent on April 9, 2015 to each participant in the RSA, background material was
provided. This information included collision diagrams and MassDOT crash data summaries for the
intersection. During the RSA meeting, these materials were reviewed as a group before the team
discussed potential solutions for the existing safety issues.
Project Location and Description
Study Area Roadways
As shown in Figure 1, Route 20 (East Main Street/Boston Post Road) in the immediate vicinity of the
intersection is a two-lane roadway that runs in the east-west direction in the City of Marlborough with a
posted speed limit of 35 miles per hour in either direction. Route 20 (East Main Street/Boston Post Road)
is classified as an urban principal arterial under MassDOT jurisdiction. The travel lanes on Route 20 vary
in width, but typically range from 11 to 12 feet wide. There are narrow shoulders varying in width present
along both sides of Route 20. A sidewalk that is approximately five feet wide is generally present along
either side of Route 20 west of Concord Road. East of Concord Road, there is generally a sidewalk
located on the southern side of Route 20.
Concord Road is a two-lane urban collector under city jurisdiction that runs in a northeast/southwest
direction through Marlborough connecting to Hudson to the northeast. Concord Road has a single lane of
travel in either direction measuring approximately 12 feet in width and shoulders on either side of the
roadway with a varying width of 1-2 feet. There is a 5-foot wide sidewalk present on the northern side of
Concord Road. In the vicinity of the intersection, there is a posted speed limit of 25 mph.
Cook Lane is mostly a two-lane road, classified as an urban collector under city jurisdiction that runs in a
north/south direction through Marlborough. From its intersection with Route 20, Cook Lane is one-way
only in the southbound direction and only accessible to vehicles heading in the eastbound direction on
Route 20. Cook Lane provides a single lane of travel in the southbound direction measuring
approximately 16 feet in width until its intersection with Peters Avenue, where Cook Lane then provides
one lane of travel in either direction. There are no shoulders on either side of the roadway. There is a
sidewalk present on the eastern side of the roadway, south of the Cook Lane intersection with Peters
Avenue.
Due to the close proximity of the intersections of Curtis Avenue and Hosmer Street with Route 20, it
should be noted that while this project focused on a single intersection (Route 20 at Concord Road), this
intersection is significantly impacted by (and will have impacts on) operations at the two adjacent
intersections to the west.
Study Area Intersections
The intersection of Route 20 (East Main Street/Boston Post Road) at Concord Road is a three-legged
unsignalized intersection maintained by MassDOT. The eastbound approach consists of an exclusive left
turn lane and a through lane. The westbound approach consists of a shared through and right turn lane.
There is no traffic control for the approaches along Route 20. The southbound approach consists of an
exclusive left turn lane and an exclusive right turn lane. The southbound approach is controlled by stop
signs and stop lines in both lanes.
Crash Data
Crash data was received from the City of Marlborough Police Department for the years 2010-2014. Based
on this data, there were a total of 48 crashes reported from the beginning of 2010 through the end of 2014
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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at the intersection of Route 20 (East Main Street/Boston Post Road) and Concord Road. Of the crashes
that occurred, approximately 19 (39%) were sideswipe collisions, including 15 sideswipe crashes in the
eastbound direction and two in the westbound direction on Route 20. There were also approximately 17
(35%) rear-end collisions, including nine rear-ends in the eastbound direction and four in the westbound
direction. Additionally, there were six angle and six single vehicle collisions at this location. Of the 48
crashes, five involved personal injuries and no fatalities were reported at the intersection.
Detailed crash diagrams are provided in Appendix C.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Road Safety Audit Observations and Potential
Improvements
During the RSA meeting, a brief introduction of the RSA process and a summary of the study area and
crash information were presented to the audit participants. Following this brief presentation, the members
of the audit team were asked to discuss the existing issues that may affect safety at the intersection of
Route 20 (East Main Street/Boston Post Road) and Concord Road. Provided below is a list of the safety
concerns that were identified during the RSA along with potential enhancements that address these
concerns.
Safety Issue #1: Traffic Operations
Observations:
It was discussed during the audit meeting that the exclusive eastbound left turn lane
frequently causes issues at this intersection. West of the intersection, Route 20 provides two
lanes in either direction but does not properly warn drivers of the upcoming exclusive
eastbound left turn lane. In an attempt to exit the left turn only lane, vehicles either suddenly
merge into the through lane or continue straight ahead in the left turn lane, as Route 20 begins
to merge into a single lane in each direction east of Concord Road. Audit members also noted
that vehicles often speed along Route 20. This is particularly an issue in the eastbound
direction as participants stated that vehicles often jockey for position just west of the
intersection; combined with the sudden realization of the lane drop for the eastbound through
movement, this creates a substantial sideswipe hazard for drivers. Crash data supports this
conclusion, as 15 out of the 19 sideswipes at this intersection were from vehicles heading in
the eastbound direction.
In addition, the southbound left turn lane
from Concord Road was also observed to
have major operational issues. There is a
large volume of vehicles utilizing the
Route
20
uncontrolled
through
movements and the resulting delay can
potentially frustrate drivers on Concord
Road. Audit participants observed that this
delay could contribute to drivers
misjudging gaps and having impatience
with the available gaps while entering onto
A vehicle blocking the entire median while
Route 20 and may also contribute to the
waiting to take a left turn onto Concord Road.
number of overall crashes at the
intersection. Concord Road also provides access to Ghiloni Park, a popular weekend
destination for visitors, and may contribute to a high level of traffic volumes entering and
exiting Concord Road during the weekends.
Enhancements:
• Consider developing a protected eastbound left turn bay or provide a better delineation
using “skip lines” in advance of the left turn lane.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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•
•
•
•
•
Extend pavement markings on Route 20 beyond the intersection to increase driver
awareness.
Provide additional police enforcement at the intersection to reinforce the speed limit.
Consider extending two through lanes along Route 20 through the intersection, as a longterm enhancement, to provide drivers more time to merge into one lane.
Signalize the intersection to provide right-of-way to vehicles entering and exiting the
minor approach, to reduce the number of sideswipe and angle collisions at this location as
well as improve capacity on the minor approaches and reduce driver frustration.
If a signalized intersection is implemented, consider coordination between the proposed
signal with the existing signal located west, at the intersection of Route 20 and Hosmer
Street, and/or adaptive signal control to account for variable traffic, particularly weekend
traffic associated with Ghiloni Park.
Safety Issue #2: Traffic Control
Observations:
The southbound approach from Concord Road is under stop control for the left turn and right
turn lanes, while the eastbound and westbound movements are free flowing with a speed limit
of 25 mph. For a vehicle to make a left out of Concord Road, they must cross two lanes of
traffic and merge into a high-speed roadway. Additionally, audit members noted the left turn
lane might confuse unfamiliar patrons that use the nearby park because of an outdated “keep
right” sign. This condition may cause the driver to take a right turn instead, leading to the
potential of a driver making an illegal U-turn after the median on Route 20. Additionally, sign
placement on the Concord Road median
islands and street may also obstruct
drivers’ sight distance.
The angle of the right turn lane combined
with the curve on Route 20 creates a
straight alignment onto Route 20 from
Concord Road. Members noted during the
meeting that this stop-controlled approach
with the straight alignment may contribute
to the four rear-end crashes recorded at the
intersection. It was also noted by audit The “Keep Right” sign heading southbound
participants that the lack of signage on Concord Road
around the intersection could increase driver inattention, creating a potential safety risk.
Enhancements:
• Evaluate the existing regulatory and warning signage, including sign placement and size,
to ensure adequate warning and sight distance for all users. Additional signage, if
implemented, should be mounted to maximize the sight distance available as the
preferred method noted in the Manual on Uniform Traffic Control Devices (MUTCD).
• Implement guide signage for Route 20 and Concord Road to help reduce confusion
among unfamiliar drivers.
• Provide additional police enforcement at the intersection to reinforce the stop-controlled
approach.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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•
•
Evaluate the implementation of Yield control at the Concord Road right turn.
Evaluate tightening the radius of the Concord Road right turn and bring it closer to the
intersection.
Safety Issue #3: Roadway Geometry
Observations:
During the RSA, it was discussed that there are several geometric issues at the intersection of
Route 20 (East Main Street/Boston Post Road) at Concord Road. The wide lanes currently at
the intersection are mostly under-utilized. It was noted by participants that heading in the
westbound direction, the travel lane widens as drivers approach the intersection, which leads
to a larger road surface. Drivers then treat the larger road surface that is currently a single
lane as two lanes, which may contribute to a number of westbound sideswipes and rear-end
collisions. There is also a significant horizontal curve along Route 20 as it intersects with
Concord Road. The sharp horizontal curve along Route 20 may also be a contributing factor
for a number of crashes at this intersection. Audit members noted that the combination of
increased vehicle speeds with the sharp horizontal curve along Route 20 could be a factor in
the five single vehicle crashes in the westbound direction that strike fixed objects, such as the
Concord Road island or the Route 20 curbing.
Enhancements:
• Re-evaluate the pavement striping to reduce the lane width on Route 20.
• Consider tightening the curbs to better direct vehicles through the intersection as a longterm enhancement.
• Consider adding warning signs, such as “Curve Ahead” or “Intersection Ahead”, on
Route 20.
• Consider extending the existing median to the west towards Hosmer Street to discourage
vehicles from making a U-turn.
• Restripe the pavement markings around the islands and medians.
• Add reflective paint or markers to the face of curbs to help drivers distinguish between
curb and pavement, potentially reducing the number of single vehicle crashes.
• Consider adding street furniture to make the islands more conspicuous to drivers and help
reduce the number of single vehicle crashes.
Safety Issue #4: Sight Distance
Observations:
Audit participants noted visibility issues
for all approaches at the intersection of
Route 20 with Concord Road. The
significant horizontal curve approaching
the intersection in both the eastbound and
westbound directions adds to the sight
distance problems at this intersection.
Sight distance heading westbound is also
Poor sight distance for vehicles turning left,
obstructed by the adjacent signage located looking west from Concord Road
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
on the median and landscaping by Cook Lane. In addition, it was noted by audit participants
that the southbound approach has issues with sight distance caused by the number of signs
and their corresponding sizes located on the island, median, and the roadway.
Sight distance issues were also discussed
more in detail for the eastbound and
southbound left turn lanes on Route 20
and Concord Road, respectively. If
vehicles are queued in the left turn only
lane to enter Concord Road, the lane
geometry negatively impacts sight
distance for vehicles attempting to make a
left turn from the Concord Road approach
onto Route 20. This causes visibility
problems as drivers are not able to see
oncoming traffic beyond the opposing
The sight distance from the Concord Road
eastbound left turn queue on Route 20.
approach, left turn lane
This may be a contributing factor in the
number of angle collisions involving the left turns at the intersection of Route 20 and
Concord Road.
Enhancements:
• Evaluate the placement and size of current signage to ensure adequate sight distance for
all movements at the intersection.
• Determine the property lines to the west of Concord Road and work with the adjacent
property owners to trim vegetation by Cook Lane to improve sight distance.
Safety Issue #5: Pedestrian and Bicycle Amenities
Observations:
At the intersection of Route 20 (East Main
Street/Boston Post Road) at Concord Road,
there are no pedestrian connections
crossing either Route 20 or the Concord
Street approach, although a pedestrian
ramp is present at the northwest corner of
the intersection, adjacent to the Concord
Street right turn lane. There is sidewalk
throughout the intersection area, with the
exception of the northeast corner of the
intersection, including the easterly side of
Concord Road and the northerly side of
A bicyclist using caution while crossing the
Route 20 east of the intersection. Audit Concord Road approach
participants stated that a demand from
Ghiloni Park to the north attracts pedestrians and bicyclists from businesses and apartments
located around the study area and also allows for any surrounding community to use the
fields for events year round. As previously mentioned, this may result in additional confusion
around the study area intersection.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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During the field visit, members noticed a utility pole that was placed in the middle of the
sidewalk on the northern side of Route 20, west of the intersection. No other amenities for
pedestrians or bicycles are present at this location.
Enhancements:
• Evaluate providing crosswalks spanning the intersection at the major and minor
approaches.
• Evaluate adding a sidewalk at the northeast corner of the intersection.
• Evaluate the feasibility of adding a dedicated bicycle lane or usable shoulder for all
approaches at this intersection.
• If implemented, provide bicycle detection for the proposed signal at Concord Road due to
the number of bicyclists that use the adjacent park.
• Evaluate relocating the utility pole or adding a sidewalk bypass to ensure adequate
sidewalk width for pedestrians.
Safety Issue #6: Access Management
Observations:
Route 20 near Concord Road provides direct access to multiple commercial and residential
properties. Observations during the RSA indicate that curb cuts on Route 20 are quite large.
There are a number of access points within the functional area of the Concord Road
intersection. Some of the residential driveways on Route 20 lack enough space for vehicles to
park without blocking part or most of the sidewalk located on Route 20. Audit members
stated that there is a sight distance issue for vehicles taking a left entering the driveway for
the Firefly’s Restaurant which may have contributed to a sideswipe crash at the location.
Audit members noted that adjacent landscaping and signage contributes to deficiencies in
sight distance. The retaining wall on the northern side of Route 20 also partially blocks sight
distance for vehicles accessing Route 20.
In addition, some members of the audit meeting stated there may be a GPS issue with the
one-way access onto Cook Lane, allowing less familiar patrons to be guided out of Cook
Lane onto Route 20. Currently, emergency response vehicles do not have an issue going
through the intersection because of the wide lanes and the free flow of Route 20 traffic.
However, future improvements may include signalizing this intersection, which may affect
emergency response times.
Enhancements:
• Evaluate existing driveways as part of a larger Safety Review/Access Management
Study/ Master Plan for Route 20.
• Evaluate the driveway widths to consolidate curb cuts within the functional area of the
intersection while still providing adequate site access.
• Consider narrowing the lanes and adding a buffer (in compliance with local ordinances)
to increase sight distance for vehicles accessing Route 20 without blocking part of the
roadway.
• Evaluate the inclusion of emergency preemption equipment with future improvements to
signalize the intersection.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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Safety Issue #7: Drainage
Observations:
Audit participants discussed drainage at the intersection of Route 20 and Concord Road as a
potential problem. There are catch basins in the northeast and northwest corners of the
intersection that may not be properly located because they are on a higher grade along the
roadway. While audit members stated that the drainage wasn’t currently a major issue at this
intersection, future improvements at the intersection may impact roadway drainage.
Enhancements:
• Review any existing drainage problems at this location and evaluate potential drainage
improvements as part of long-term improvements to the intersection.
• Evaluate catch basin locations along with roadway grading to optimize drainage within
the intersection.
Recommendations
After discussing the various safety deficiencies within the intersection, participants discussed potential
solutions. The audit participants were encouraged to consider both short and long-term improvements for
each of the existing safety issues. Each improvement considered has been categorized as short-term, midterm, or long-term based on the definitions shown in Table 2. Additionally, a cost category has been
assigned to each improvement based on the parameters set forth in Table 2.
Table 2. Estimated Time Frame and Costs Breakdown
Time Frame
Costs
Short-Term
<1 Year
Low
<$10,000
Mid-Term
1-3 Years
Medium
$10,001-$50,000
Long-Term
>3 Years
High
>$50,000
Summary of Road Safety Audit
A summary of the potential recommendations discussed by the RSA audit team are summarized in Table
3. The recommendations are summarized based on the potential safety payoff, time frame, approximate
cost and responsible agency. The safety payoff is a subjective judgment of the potential effectiveness of
the safety recommendations listed below.
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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Table 3. Potential Safety Enhancement Summary
Safety Issue
Potential Safety Enhancement
Safety
Payoff
Time Frame
Cost
Responsible
Agency
Route 20 (East Main Street/Boston Post Road) at Concord Road
Traffic Operations
Consider developing a protected eastbound left
turn bay or provide better delineation using “skip
lines”
Medium
Short-Term
Low
MassDOT
Traffic Operations
Extend pavement markings on Route 20 beyond
the intersection to increase driver awareness
Medium
Short-Term
Low
MassDOT
Traffic Operations
Provide additional police enforcement at the
intersection to reinforce the speed limit
Medium
Short-Term
Low
City of
Marlborough
Traffic Operations
Consider extending the two through lanes along
Route 20 through the intersection
Medium
Long-Term
High
MassDOT
Traffic Operations
Signalize the intersection to provide right-ofway to vehicles entering and exiting the minor
approach
High
Long-Term
High
MassDOT
Traffic Operations
If a signalized intersection is implemented,
consider coordination with adjacent signals
and/or adaptive signal control to account for
variable traffic
High
Long-Term
High
MassDOT
Traffic Control
Evaluate the existing regulatory signage,
including sign placement and size, to ensure
adequate warning and sight distance for all
users
Medium
Short-Term
Low
MassDOT
Medium
Short-Term
Low
MassDOT
Low
Mid-Term
Medium
City of
Marlborough
Traffic Control
Traffic Control
Implement guide signage for Route 20 and
Concord Road to help reduce confusion among
unfamiliar drivers
Provide additional police enforcement at the
intersection to reinforce the stop controlled
approach
Traffic Control
Evaluate Yield control at the Concord Road right
turn
Low
Short-Term
Low
MassDOT
Traffic Control
Evaluate tightening the radius of the Concord
Road right turn
High
Long-Term
High
MassDOT
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Safety Issue
Potential Safety Enhancement
Safety
Payoff
Time Frame
Cost
Responsible
Agency
Low
Short-Term
Low
MassDOT
Roadway Geometry
Re-evaluate the pavement striping to reduce the
lane width on Route 20
Roadway Geometry
Consider tightening the curbs to better direct
vehicles through the intersection
Medium
Long-Term
High
MassDOT
Roadway Geometry
Consider adding the warning signs (“Curve
Ahead” or “Intersection Ahead”)on Route 20
Medium
Short-Term
Low
MassDOT
Roadway Geometry
Consider extending the existing median to the
west towards Hosmer Street to discourage
vehicles from making a U-turn
Medium
Long-Term
High
MassDOT
Roadway Geometry
Restripe the pavement markings around the
islands and medians
Medium
Short-Term
Low
MassDOT
Roadway Geometry
Add reflective paint or markers to the face of
curbs
Medium
Short-Term
Low
MassDOT
Roadway Geometry
Consider adding street furniture to make the
islands more conspicuous to drivers and help
reduce the number of single vehicle crashes
Low
Mid-Term
Medium
MassDOT
Sight Distance
Evaluate the placement and size of current
signage to ensure adequate sight distance
Medium
Short-Term
Low
MassDOT
Sight Distance
Determine property lines and work with adjacent
property owners to trim vegetation by Cook
Lane to improve sight distance
Medium
Short-Term
Low
City of
Marlborough/
MassDOT/
Property Owners
Pedestrian & Bicycle
Amenities
Evaluate providing crosswalks spanning the
intersection
Medium
Mid-Term
Medium
MassDOT
Pedestrian & Bicycle
Amenities
Evaluate adding a sidewalk at the northeast
corner of the intersection
High
Long-Term
High
MassDOT
Pedestrian & Bicycle
Amenities
Evaluate the feasibility of adding a dedicated
bicycle lane or usable shoulder for all
approaches at this intersection
Medium
Short-Term
Low
MassDOT
Pedestrian & Bicycle
Amenities
If implemented, provide bicycle detection for the
proposed signal at Concord Road due to the
number of bicyclists that use the adjacent park
High
Long-Term
High
MassDOT
Pedestrian & Bicycle
Amenities
Evaluate relocating the utility pole or adding a
sidewalk bypass
Low
Mid-Term
Medium
MassDOT
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
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Safety Issue
Potential Safety Enhancement
Safety
Payoff
Time Frame
Cost
Responsible
Agency
Access Management
Evaluate existing driveways as part of a larger
Safety Review/Access Management Study/
Master Plan for Route 20
Medium
Long-Term
High
City of
Marlborough/
MassDOT/
Property Owners
Access Management
Evaluate the driveway widths to consolidate
curb cuts
Medium
Long-Term
High
MassDOT/
Property Owners
Access Management
Consider narrowing the lanes and adding a
buffer to increase sight distance for vehicles
Medium
Mid-Term
Medium
MassDOT
Access Management
Evaluate the inclusion of emergency preemption
equipment with future improvements to signalize
the intersection
High
Long-Term
High
MassDOT/City of
Marlborough
Drainage
Review any existing drainage problems at this
location and evaluate potential improvements
Low
Mid-Term
Medium
MassDOT
Drainage
Evaluate catch basin locations along with
roadway grading to optimize drainage
Medium
Long-Term
High
MassDOT
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Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
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Appendix A. RSA Meeting Agenda
Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Appendix B. RSA Audit Team Contact List
Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Participating Audit Team Members
Date:
April 21, 2015
Audit Team
Members
John Mastera
William Ullom
Lola Campbell
Joe Frawley
Sarah Kurpiel Lee
Location:
Marlborough DPW, Marlborough, MA
Agency/ Affiliation
Email Address
MassDOT Traffic Safety
John.Mastera@state.ma.us
MassDOT Traffic Safety
William.Ullom@dot.state.ma.us
MassDOT – District 3 Traffic
Alolade.campbell@state.ma.us
MassDOT – District 3 Traffic
joseph.frawley@dot.state.ma.us
MAPC
slee@mapc.org
Timothy Collins
City of Marlborough DPW
Tcollins@marlborough-ma.gov
Evan Pilachowski
City of Marlborough DPW
epilachoski@marlborough-ma.gov
Tim Naze
City of Marlborough Fire
Department
tnaze@marlborough-ma.gov
John McGrath
City of Marlborough Police
Department
jmcgrath@marlborough-ma.gov
Brian Brosnan
Vanasse Hangen Brustlin
(VHB)
bbrosnan@vhb.com
Phil Viveiros
McMahon Associates
pviveiros@mcmahonassociates.com
Alexander
Lacouture
McMahon Associates
alacouture@mcmahonassociates.com
Phone
Number
857-368-9648
857-368-9622
508-929-3887
508-929-3916
617-933-0744
508-624-6910
x7203
508-624-6910
x7200
508-624-6967
508-624-6984
508-752-1001
508-823-2245
508-823-2245
Road Safety Audit— Route 20 (East Main Street/Boston Post Road) at Concord Road - Marlborough, MA
Prepared by McMahon Associates, Inc.
FINAL
Appendix C. Detailed Crash Data
Crash Data Summary Table
E. Main St.and Boston Post Rd. at Concord Rd., Marlborough, MA
1/1/2010-12/31/2014
Crash
Diagram
Crash Date
1 2/27/2010
Crash Day
Saturday
Time of Day
10:00 AM
Manner of Collision
Sideswipe, same direction
Light Condition
Daylight
Weather
Condition
Snow
Road Surface
Driver Contributing Code
Comments
Ages
Wet
Failed to yield right of way
43
40
33
44
2 3/7/2010
Sunday
2:42 PM
Sideswipe, same direction
Daylight
Clear
Dry
Disregarded traffic signs, signals,
road markings
3 5/7/2010
Friday
7:04 AM
Single Vehicle Crash
Daylight
Clear
Dry
No Improper Driving
39
4 7/1/2010
Thursday
10:59 AM
Sideswipe, same direction
Clear
Dry
No Improper Driving
48
5 9/3/2010
Friday
12:04 AM
Single Vehicle Crash
Clear
Dry
Physical Impairment
21
6 9/16/2010
Thursday
7:13 PM
Rear-end
Rain
Wet
No Improper Driving
18
42
7 10/8/2010
Friday
7:10 PM
Sideswipe, same direction
Daylight
Dark - lighted
roadway
Dark - lighted
roadway
Dark - lighted
roadway
Clear
Dry
Inattention
41
28
8 10/19/2010
9 11/6/2010
Tuesday
Saturday
3:01 PM
12:57 PM
Sideswipe, same direction
Rear-end
Daylight
Daylight
21
37
Friday
7:48 AM
Rear-end
Daylight
Dry
Failed to yield right of way
Dry
Followed too closely
Sand, mud, dirt,
oil, gravel
No Improper Driving
22
22
10 12/17/2010
Clear
Clear
Blowing Sand,
Snow
39
26
11 1/28/2011
Friday
3:25 PM
Sideswipe, same direction
Clear
Wet
Failed to yield right of way
64
24
12 3/11/2011
13 4/26/2011
Friday
Tuesday
12:18 AM
5:39 PM
Single Vehicle Crash
Angle
Daylight
Dark - roadway not
lighted
Daylight
Rain
Clear
Wet
Dry
Over-correcting/over-steering
Inattention
19
41
43
14 5/6/2011
15 6/22/2011
16 7/12/2011
Friday
Wednesday
Tuesday
4:33 PM
4:33 PM
12:58 PM
Rear-end
Rear-end
Sideswipe, same direction
Daylight
Daylight
Daylight
Clear
Rain
Clear
Dry
Wet
Dry
35
19
20
49
21
46
17 7/31/2011
Sunday
12:29 PM
Angle
Daylight
Clear
Dry
No Improper Driving
Followed too closely
Failed to yield right of way
Disregarded traffic signs, signals,
road markings
59
69
Dark - lighted
roadway
Clear
Dry
No Improper Driving
31 UNK
V2 in left turn lane continued straight ahead onto Bost Post Rd.and
sideswiped V1.
V2 in left turn lane continued straight ahead onto Bost Post Rd.and
sideswiped V1.
V2 made a wide left turn onto Concord Rd. from E. Main St., forcing V1
(traveling EB on Rte. 20) to swerve into a curb to avoid a collision. V2 left the
scene.
V2 in left turn lane continued straight ahead onto Bost Post Rd.and
sideswiped V1.
51
OUI crashed into curb on Concord Rd.
V1 side swiped V2 when changing lane.
V1 stopped to turn left from Concord Rd. into 350 E. Main St. V2 attempted
to pass and hit V1.
51
V2 going EB on Rt20 swerved into snowbank then lost control and side
swiped V1.
V1 blinded by oncoming headlights and hit median.
V2 was trying to change lane and slowed down abruptly. The operator of V1
stated his brake system failed causing him to rear-end V2.
V2 sideswiped V1 when merging into the right lane to continue EB.
The other vehicle fled the scene. Police used the injury code 1 (fatal), but it's
not a fatal based on narrative
An unknown vehicle hit the driver's side rear bumper of V2, causing V2 to
rear end V1.
18 10/3/2011
Monday
7:37 PM
Sideswipe, same direction
19 10/24/2011
Monday
1:27 PM
Rear-end
Dry
No Improper Driving
64
Wednesday
Monday
Friday
5:07 PM
9:11 AM
2:21 PM
Rear-end
Single Vehicle Crash
Rear-end
Daylight
Dark - lighted
roadway
Daylight
Daylight
Cloudy
20 12/14/2011
21 4/30/2012
22 5/25/2012
Cloudy
Clear
Clear
Dry
Dry
Dry
32 UNK
64
32
32
V1 travelling west on Rt20 and hit the curb and lost control.
23 7/16/2012
24 8/15/2012
Monday
Wednesday
7:17 AM
5:53 AM
Sideswipe, same direction
Single Vehicle Crash
Daylight
Dawn
Clear
Cloudy
Dry
Dry
45
60
V1 side swiped V2 when changing lane.
V1 going WB struck the island.
25 10/17/2012
26 11/5/2012
Wednesday
Monday
3:05 PM
2:45 PM
Sideswipe, same direction
Sideswipe, same direction
Daylight
Daylight
Clear
Clear
Dry
Dry
Followed too closely
Fatigued/asleep
Inattention
Failure to keep in proper lane or
running off road
Inattention
Failure to keep in proper lane or
running off road
Unknown
27 12/15/2012
28 2/10/2013
Saturday
Sunday
11:18 AM
4:24 PM
Angle
Rear-end
Cloudy
Clear
Dry
Wet
Failed to yield right of way
Followed too closely
42
36
48
35
Tuesday
Friday
Monday
Wednesday
6:44 PM
8:08 AM
5:47 PM
5:18 PM
Sideswipe, same direction
Rear-end
Sideswipe, same direction
Angle
Daylight
Daylight
Dark - lighted
roadway
Daylight
Daylight
Daylight
Cloudy
Clear
Clear
Clear
Wet
Dry
Dry
Dry
52
28
25
53
63
26
29
24
33 4/19/2013
Friday
6:42 PM
Single Vehicle Crash
Daylight
Cloudy
Dry
No Improper Driving
Inattention
Unknown
Failed to yield right of way
Operating Vehicle in erratic, reckless,
careless, negligent, or aggressive
manner
34 5/20/2013
35 7/6/2013
Monday
Saturday
2:34 PM
4:22 PM
Angle
Sideswipe, same direction
Daylight
Daylight
Clear
Clear
Dry
Dry
Failed to yield right of way
Inattention
30
44
29
30
31
32
2/12/2013
3/15/2013
4/8/2013
4/10/2013
27 UNK
31
45
80
UNK UNK
42
52
29
V2 rearended V1 and then V3 merged into right lane and rear ended V2 at
35 where two lanes merge into one lane.
Road was narrow due to snow
V2 sideswiped into V1 from left turn lane.
V1 hit the curb.
V2 turning left from Concord Rd into Rt20 drove into the drivers rear of V1
waiting to turn left onto Concord Rd from Rt20 EB.
V2 sideswiped V1, both vehicles were going WB on East Main Street.
Crash Data Summary Table
E. Main St.and Boston Post Rd. at Concord Rd., Marlborough, MA
1/1/2010-12/31/2014
Crash
Diagram
Crash Date
36 7/9/2013
Crash Day
Time of Day
Manner of Collision
Light Condition
Weather
Condition
Road Surface
Driver Contributing Code
Ages
Tuesday
4:47 PM
Angle
Daylight
Clear
Dry
Visibility Obstructed
81
7/29/2013
8/1/2013
8/23/2013
8/31/2013
Monday
Thursday
Friday
Saturday
11:11 AM
12:46 PM
2:42 PM
4:12 PM
Sideswipe, same direction
Angle
Rear-end
Rear-end
Daylight
Daylight
Daylight
Daylight
Clear
Clear
Clear
Clear
Dry
Dry
Dry
Dry
Made an improper turn
No Improper Driving
Inattention
Inattention
72
90
24 UNK
21
23
69
38
41 9/16/2013
42 10/3/2013
Monday
Thursday
5:10 PM
4:43 PM
Rear-end
Sideswipe, same direction
Daylight
Daylight
Clear
Clear
Dry
Dry
No Improper Driving
No Improper Driving
51
51
37
38
39
40
Sideswipe, same direction
2:36 PM
43 10/26/2013 Saturday
Angle
12:54 PM
44 12/21/2013 Saturday
Monday
Rear-end
2:28 PM
45 7/14/2014
Tuesday
Sideswipe, same direction
12:22 PM
46 7/15/2014
Thursday
Rear-end
4:56 PM
47 9/18/2014
Tuesday
Rear-end
7:18 AM
48 12/9/2014
Summary based on Crash Reports obtained from the Marlborough Police Department
Daylight
Daylight
Daylight
Daylight
Daylight
Daylight
Clear
Clear
Clear
Clear
Cloudy
Rain
Dry
Dry
Dry
Dry
Dry
Wet
Made an improper turn
Failed to yield right of way
Followed too closely
No Improper Driving
Followed too closely
Followed too closely
53
24
54
36
72
41
28
45
56
65
29
17
46
52
17
Comments
V1 traveling EB on Rte. 20 hits V2 who was turning left onto Rte. 20 from
Concord Rd.
V2 was in left turn lane and tried to merge into right lane. V2 side swiped V1 .
V2 fled the scene after sideswiping V1.
V2 rear-ended V1. The operator of V2 stated V1 changed lanes without
directional.
V1 and V2 stopped on Concord Rd. to turn left onto Rte. 20 E. V1 enters
intersection, unable to complete turn and stops. Unknown WB vehicle stops
and motions V2 to cross. V2 then fails to pass V1 and collides.
Rearend in congestion.
V2 sideswiped into V1 from left turn lane.
V1 rearended while trying to turn left onto Concord Rd.
Crash Data Summary Tables and Charts
E. Main St.and Boston Post Rd. at Concord Rd., Marlborough, MA
CRASH MONTH
25%
19%
20%
15%
15%
11%
10%
5%
2%
6%
4%
9%
9%
11%
9%
4%
2%
0%
J
F
M
A
M
J
J
A
S
O
N
D
CRASH DAY OF WEEK
25%
23%
21%
20%
15%
15%
11%
13%
11%
10%
6%
5%
0%
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
CRASH TIME OF DAY
28%
30%
21%
20%
10%
0%
15%
9%
6AM- 8AM
11%
4% 6%
8AM10AM
10AM12PM
0% 0%
12PM- 2PM- 4PM4PM- 6PM6PM- 8PM
2PM
8PM10PM
10PM12AM
4%
0% 2%
12AM- 2AM- 4AM4AM- 6AM
2AM
CRASH MANNER OF COLLISION
40%
36%
34%
30%
20%
17%
13%
10%
0%
0%
Single
Vehicle
Crash
Rear-end
Crash Data SpreadsheetFINAL.xlsx
Angle
Sideswipe, Sideswipe,
same
opposite
direction
direction
1 of 2
0%
Head on
0%
0%
Rear to Rear Unknown
3/23/2015
Crash Data Summary Tables and Charts
E. Main St.and Boston Post Rd. at Concord Rd., Marlborough, MA
CRASH LIGHT CONDITION
100%
80%
60%
40%
20%
0%
80%
83%
Daylight
2%
0%
Dawn
Dusk
13%
Dark Lighted
Roadway
2%
0%
0%
0%
Dark Roadway
not lighted
Dark unknown
roadway
lighting
Other
Unknown
CRASH WEATHER CONDITION
74%
60%
0%
Other
0%
Unknown
2%
0%
Blowing
sand, snow
0%
Severe
Crosswinds
0%
Fog, Smog,
Smoke
0%
Sleet, Hail,
Freezing
Rain
Rain
Clear
0%
9%
Cloudy
15%
20%
Snow
40%
CRASH ROAD SURFACE
100%
80%
60%
40%
20%
0%
83%
15%
Dry
Wet
0%
0%
Snow
Ice
2%
0%
Sand, mud, Water
dirt, oil, (standing,
gravel
moving)
0%
0%
0%
Slush
Other
Unknown
CRASH DRIVER AGES
30%
26%
19%
20%
10%
0%
20%
14%
9%
6%
15-20
21-29
Crash Data SpreadsheetFINAL.xlsx
30-39
40-49
50-59
2 of 2
60-69
2%
4%
70-79
80+
3/23/2015