TECHNICAL
MEMORANDUM
To: Casey Arborway Project Team
From: Jonathan Kapust
Cc: Project File
Subject: Casey Arborway Project
Design Vehicle for Arborway U-Turns
Date: 2/5/2013
Introduction
The design of the U-turns is a critical element in the Casey Arborway Project. The design team has taken
a systematic approach to designing the project’s median U-turns for the appropriate design vehicles. The
design process has included a coordinated effort between the Department of Conservation and Recreation
(DCR), MassDOT and the designer to develop the U-turns to meet the traffic demands for the corridor,
while also maintaining the existing operations and preserving the historical and aesthetic significance of
the Arborway.
This technical memorandum documents the supporting regulations, design meetings, design manual
criteria, and engineering analysis used to arrive at the median U-turn sizing and design vehicle chosen for
the project.
Design Background:
The reconfiguration of the Arborway into a surface street road network incorporated a feature known
colloquially known as a “Michigan Left” in the place of allowing traditional left turns at the signalized
intersections from the Arborway eastbound and westbound to Washington Street or South Street. The
Michigan Left is essentially a median U-turn that occurs after a signalized intersection, allowing a vehicle
desiring to turn left to make a U-turn on the mainline roadway, and then a right turn at the original
intersection. This allows the intersections to operate safely and more efficiently as they process more
vehicles per signal cycle.
Typically U-turns of this nature require one of two design elements: a wide median, or if the space is
limited, a truck apron – also called a loon – along the outside curb line. A truck apron is a paved, often
concrete, area outside of the normal travelled way that allows larger vehicle to execute turns when the
roadway width is limited. An example location of these truck aprons is the center island of a roundabout.
Page 2 of 5
The trucks that could be using these U-turns are WB-40 1 and W-62 2 vehicles. A WB-40 vehicle is an
intermediate-sized tractor-trailer that is commonly seen in urban environments. A WB-62 vehicle is an
interstate-sized tractor-trailer that is commonly seen on major highways and interstates for long distance
transport, as well as for short distance transport of oversized equipment. For the Arborway, a minimum
median width of 60 feet would be needed to allow a WB-62 to execute a U-turn without an apron. A 50foot wide median would be needed to allow a WB-40 to execute a U-turn without an apron. Otherwise a
truck apron needs to be used to accommodate large vehicles. Through the Working Advisory Group
meetings, the desire by the public to increase parkland (including the addition of off street bike paths)
along the edges of the roadways facilitated a narrow median width. Therefore, truck aprons would be
needed to meet the turning needs of the design vehicles. The addition of these truck aprons to
accommodate the design vehicles does not require any additional takings or easements. The aprons are
within the public right-of-way.
Design Regulations:
The Arborway has historically been limited to “pleasure vehicles” only, meaning non-commercial
vehicles. This would exclude all commercial vehicles, including larger trucks such as a WB-40 or WB-62.
In addition, there are currently restrictions on trucks weighing 2.5 tons or more within the project limits
on Arborway Westbound, Arborway Eastbound, Arborway Road, Forest Hills Street, and Circuit Drive,.
Under current conditions, larger trucks are permitted to make left turns to South Street and Washington
Street via New Washington Street, although many larger trucks require the use of the right travel lane on
New Washington Street to complete their turns. In the review of the proposed at-grade alternative design,
DCR and MassDOT determined trucks would still not be permitted on the Arborway from South Street
west to Murray Circle. However, trucks would be allowed to use the median U-turn as a means to reverse
direction safely without continuing on the Arborway illegally.
The Arborway from the western project limit to Shea Circle and Washington Street (North of Arborway)
are designated as part of the National Highway System (NHS). In addition, Forest Hill Station is an NHS
terminal, specifically for passenger travel. There are no designated freight yards near the project limits
according to the latest MassDOT Freight Plan, dated September, 2010. Although a key design regulation,
the NHS does not require roadways be designed to a certain vehicle or speed. The regulation that is more
specific to design requirements is the National Network (NN). The NN refers to the roadways designated
by the Surface Transportation Assistance Act of 1982 (STAA) that must be able to carry trucks with a
1
2
The WB-40 vehicle is an intermediate semitrailer with a front axle of cab to rear axle of trailer wheelbase of 40 feet. See
AASHTO’s A Policy on Geometric Design of Highways and Streets, 2011 pgs. 2-10 to 2-32 for vehicle turning templates.
The WB-62 vehicle is an interstate semitrailer with a front axle of cab to rear axle of trailer wheelbase of 62.5 feet. In
addition, it is common for WB-67 vehicles to move their trailer axles forward to navigate city roads. AASHTO’s A Policy on
Geometric Design of Highways and Streets, 2011, elaborates on this on page 2-5. See AASHTO’s A Policy on Geometric
Design of Highways and Streets, 2011 pgs. 2-10 to 2-32 for vehicle turning templates
Page 3 of 5
minimum 40 foot long trailer. Typically, the NHS and NN are comprised of the same roadways.
However, the roadways on the NHS within the project area are not part of the NN. Therefore, those NHS
roadways within the project area do not need to be designed to a specific design vehicle, allowing
engineering judgment and existing conditions to be considered in determining a final design approach.
The roadways within the project area carry school buses, public transit buses, and charter buses. These
roadways also border a major transit hub, Forest Hills Station, and several popular recreation
destinations.
Design Criteria:
All geometric elements of the proposed design are based on design standards and criteria set forth by
AASHTO’s A Policy on Geometric Design of Highways and Streets, 2011, MassDOT’s Project Development
and Design Guide, 2006, and the DCR’s Historic Parkways Treatment Guidelines, 2007. Additional
guidance in design is from the Boston’s Complete Streets Guidelines, December 2010 Draft. The geometric
elements, such as horizontal curve radii and vertical curve lengths, are controlled by the design vehicle
and the design speed. The design speed and vehicle are determined by the roadway’s functional
classification, the observed 85th percentile speed, the posted speed, and any jurisdictional speed
regulations.
The roadways within the project area are characterized functionally 3 as follows:
Roadway
Monsignor Casey Highway (Arborway)
Morton Street/ Shea Circle
Washington Street (N. of Arborway)
Washington Street (S. of South Street (south))
Washington Street (Between South Street (north) and South Street
(south))
South Street (S. of Arborway)
South Street (N. of Arborway)
Hyde Park Ave.
Forest Hills Street
Cemetery Road & Forest Hill Road
Circuit Drive (Jewish War Veterans Drive)
3
NHS
X
X
X
Functional Classification
Principal Arterial
Principal Arterial
Urban Principal Arterial
Urban Principal Arterial
Urban Collector
Urban Collector
Urban Minor Arterial
Urban Principal Arterial
Urban Collector
Urban Collector
Urban Minor Arterial
3
See section 1.3 of AASHTO’s A Policy on Geometric Design of Highways and Streets, 2011.
4
See attached maps for NHS and Functional Classification
4
Page 4 of 5
The design criteria for the project are primarily based on design speed and design vehicle. To determine
the appropriate speed and vehicles, the functional classification of the roadway is obtained as shown
above. The Arborway, while on NHS, is designated by the DCR to be restricted to passenger vehicles.
This applies to the Arborway west of South Street. East of South Street, the proposed roadway allows for
trucks to travel on the Arborway and Morton Street (Route 203), as well as northbound and southbound
on Washington Street and Hyde Park Ave. Urban Principal Arterials are usually capable of carrying truck
traffic and are often have some of the heavier volumes of traffic in the region. The roads listed in this
project as Principal Arterials match this description.
The three roadways listed above as Principal Arterials, Casey Arborway, Morton Street and Washington
Street (North of the Arborway) will need to handle larger truck movements. This can be accomplished in
two ways: 1) provide a turning movement for the design vehicle to its destination or 2) provide a signed
truck route bypassing the original route. The Casey Arborway Project will provide both indirect turning
movements for the design vehicle via the median U-turns, and a truck route that utilizes Ukraine Way 5.
The median U-turns will require truck aprons along the curb lines to accommodate the larger vehicles.
These aprons will be separated from the sidewalk and/or bikepaths by 6” granite curb, and will be
considered the edge of pavement for the roadway. Based on the design criteria, field observations and
design regulations, it is determined that the Western U-turn will be designed to allow a WB-62 vehicle
and the Eastern U-turn will be designed to allow a WB-40 & City Bus vehicle.
The curb line design for the truck apron at the Western U-turn will curve in towards the Arboretum Gate
intersection. The shared use path will be maintained around the curve of the U-turn at a minimum width
of 12 feet. Per the MassDOT 25% Submission Traffic/DER Comment & Resolution Meeting on January
22, 2013, MassDOT District 6, MassDOT Traffic and Safety Engineering Section, and the HNTB Design
team concurred that the truck apron should accommodate the WB-62 and, if possible, the westbound
lanes should not be relocated farther north. The existing ramp for the on-street bike lane to transition
onto the off-street facility will be located prior to the intersection and merge with the shared use path.
The curb line design for the truck apron at the Eastern U-turn will curve in towards the Arborway Yard.
The bikepath and sidewalk will be maintained parallel to the westbound travel lanes at an offset of 25 feet,
or will be curved around the edge of the apron. Per the MassDOT 25% Submission Traffic/DER
Comment & Resolution Meeting on January 22, 2013, MassDOT District 6, MassDOT Traffic and Safety
Engineering Section, and the HNTB Design team concurred that the truck apron should accommodate
the WB-40 and a City Bus design vehicle. If possible, the westbound lanes should not be relocated farther
5 Ukraine way is a connector route immediately south of Forest Hills Station that connects Hyde Park Ave and Washington
Street. The roadway can currently accommodate at all corners a WB-40 vehicle and a WB-62 at 3 of the 4 right turns. With
some minor curb adjustments, the 4th right turn will meet a WB-62.
Page 5 of 5
north. Additional signage will need to be considered for this U-turn to inform trucks larger than WB-40
to seek an alternate truck route.
Based on current truck restrictions on the Arborway, and the design vehicle sizes for the median U-turns,
HNTB has determined that only 3 movements for vehicles larger than a WB-40 or City Bus are not
accommodated by the median U-turns: South Street Northbound to Washington Street Northbound,
South Street Southbound to Washington Street Northbound, and Washington Street Northbound
(southern section) to Washington Street Northbound (northern section). These truck movements can be
accommodated via a signed truck route that utilizes Ukraine way. See the attached diagram for proposed
routes that are to be signed. Additional signage will be posted to restrict trucks from roadways that they
are prohibited from travelling on.
Conclusion
From the design meetings, design manuals, regulatory criteria, and engineering analysis, the design team
has determined that the western median U-turn should be designed to allow a WB-62 design vehicle and
the eastern median U-turn should be designed to allow a WB-40 or City Bus design vehicle.
Commonwealth of Massachusetts
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LIB E RT Y S TR
E ET
±
³
ME M OR
L S TR
M IL
D
IA
IN
RE
ST
RE
ET
D
OA
C
EN
E
TR
S
T
DR
O
EE
O
Y W
IC K
H
ET
S
T
R
PI
N
E
T
ST
RE
ET
TR A C
TR
ET
EE
T
ET
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B O L I V AR S T
UT
ST
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S
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W A LP O L E
E
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H IG H L AN D AV EN U
RE V
A N ST R E E T
P LEAS
ER M
EE T
18
SH
Data Sources:
Roads: 1:5,000 Massachusetts Road Inventory Centerline File: January 2012. Rails: 1:5,000 Massachusetts Rail Inventory Centerline File: January 2012. Transportation assets: Planning maintained files.
Boundary layers: MassGIS 1:5,000 maintained files. Ponds, streams and other environmental layers: MassGIS 1:5,000 maintained files.
Note:
This map was produced by the Office of Transportation Planning. The Federal Highway Administration provided funding for the production of this map through the State Planning and Research Program.
The location of the boundaries and features shown on this map are approximate and are intended for planning purposes only. This map is not intended to be used for survey, engineering or legal purposes.
For more information call: (617) 973-7313
File: FedAid-Distric6.mxd
Date: March 08, 2012
²
1 inch = 0.6 miles
0
0.5
1
2 Miles
KS
TR
E ET
N
SOUTHWEST
CORRIDOR
PARK
YA
RB
O
RW
A
YW
B
RW
A
BO
RW
AY
RO
AD
YE
B
EE
T
ST
R
AR
N
RB
O
TO
CA
SE
TRUCK ROUTE FROM SOUTH
W
AS
HI
NG
YA
TRUCK ROUTE FROM
NORTH AND WEST
EET
SOUTH STR
CA
SE
LEGEND
ARBORWAY
YARD
ARNOLD
ARBORETUM
WESTERN MEDIAN U-TURN
EASTERN MEDIAN U-TURN
CASEY ARBORWAY WB
CASEY ARBORWAY EB
FRONTAGE ROAD
FOREST HILLS
STATION
T
M
OR
E
RE
N
ST
RE
ET
LL RO
AD
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SO
AD
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UR
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RK
SH
AV
ING
EN
TO
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NS
TR
EE
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ORCH
A
AS
TO
W
ER
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ET
HY
DE
PA
WA
STATE LABS
COURTHOUSE
TO
T
HS
UK
RA
INE
WA
Y
CASEY ARBORWAY PROJECT
PROPOSED SIGNED TRUCK ROUTE
DRAFT FOR REVIEW
FEBRUARY 13, 2013
NOT TO SCALE