20260910 Signal Plans Union Sq Somerville 4.pdf

PDF 5 MB Posted Sep 17, 2026

Attached to: IFB 123-26 Transit Signal Priority Project
Solicitation number: BD-27-1206-40000-40000-133492
Issued by: Massachusetts

About this file

Written by GovTribe AI · Sep 18, 2026

This document comprises traffic signal plans and technical specifications for the Union Square Transportation Improvements project in Somerville, Massachusetts, developed by the MBTA (Massachusetts Bay Transportation Authority) in coordination with the City of Somerville. The project involves the installation and upgrade of traffic signal equipment, including video detection systems, emergency vehicle preemption (EVP) detectors, wireless ethernet antennas, accessible pedestrian signal (APS) pushbuttons, vehicular and pedestrian signal heads, mast arms, control cabinets, and related conduit infrastructure. The plans establish signal phasing coordination across multiple intersections including Webster Avenue, Prospect Street, Washington Street, and Somerville Avenue, with detailed pavement markings for bike lanes, crosswalks, stop lines, and channelization. The document includes temporary traffic control (TTC) zone specifications, taper length calculations based on posted speed limits ranging from 20 to 25 mph, and advance warning sign placement requirements in accordance with the Manual on Uniform Traffic Control Devices (MUTCD) and Massachusetts amendments. Signal coordination plans are provided for weekday morning and afternoon peak periods on a 120-second cycle, with specific offsets and phase timing detailed for each intersection approach.

The plans establish contractor responsibilities for wire pulling from proposed signal equipment to the nearest power source, verification of existing signal conduit capacity, and testing of existing equipment and power supplies prior to new signal installation. Contractors must retain all existing signal equipment unless otherwise noted and are required to notify abutters at least 24 hours in advance of work requiring temporary access closures. Temporary parking restriction signs must be requested from the City of Somerville's Parking Department and placed at least two business days before restrictions take effect. All temporary traffic control devices, including sequentially flashing lights on the first ten plastic drums in tapers and reflectorized plastic drums, must comply with NCHRP Report 350 and MASH standards. The document reflects existing signal phasing as maintained by the City of Somerville, with the designer assuming no responsibility for compliance with current standards regarding the existing phasing configuration.

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MIDDLESEX COUNTY

CITY OF SOMERVILLE

1" = 200'

4002001000

FEET

LOCUS PLAN

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UNION SQUARE

TRANSPORTATION IMPROVEMENTS

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ONLY

DBYL

BWL

SWL

DWLEx

DYL

DWL

SYL

WDWL

WSWL

SWCHL

SYGL

EXISTING TO

REMOVE

EXISTING TO

REMAIN PROPOSED DESCRIPTION

VIDEO DETECTION ZONE

ADVANCE VIDEO DETECTION CAMERA

EMERGENCY VEHICLE PREEMPTION (EVP) DETECTOR

WIRELESS ETHERNET ANTENNA

APS PUSHBUTTON, SIGN, AND SADDLE

VEHICULAR SIGNAL HEAD

PEDESTRIAN SIGNAL HEAD, (TYPE AS NOTED OR AS SPECIFIED)

SIGNAL POST AND BASE (ALPHA-NUMERIC DESIGNATION NOTED)

MAST ARM, SHAFT AND BASE (ARM LENGTH AS NOTED)

SIGN AND POST

SIGN AND POST (2 POSTS)

CONTROL CABINET, GROUND MOUNTED

PULL BOX 12"x12" (OR AS NOTED)

ELECTRIC HANDHOLE 12"x24" (OR AS NOTED)

TRAFFIC SIGNAL CONDUIT

EXISTING PROPOSED DESCRIPTION

PAVEMENT ARROW - WHITE

LEGEND "ONLY" - WHITE

WHITE STOP LINE (12" UNLESS OTHERWISE SPECIFIED)

WHITE - CROSSWALK (12" LINES, 10' O.C.; 12" LONGITUDINAL LINES, 4' O.C.) (UNLESS

OTHERWISE SHOWN)

6" SOLID WHITE LINE

6" SOLID YELLOW LINE

6" BROKEN WHITE LINE 10' MARK - 30' SKIP

6" DOTTED WHITE LINE 3' MARK - 9' SKIP

6" DOTTED YELLOW LINE 3' MARK - 9' SKIP

6" DOTTED WHITE LINE EXTENSION 2' MARK - 6' SKIP

2-6" DOUBLE YELLOW LINE

12" WIDE SOLID WHITE LINE

12" DOTTED WHITE LINE 3' MARK - 9' SKIP

12" ELEPHANT TRACKS 2' MARK - 2' SKIP

12" SOLID WHITE CHANNELIZED LINE

12" SOLID YELLOW GORE LINE

BIKE LANE SYMBOL

SHARED USE LANE SYMBOL

BIKE CROSSING

BUS LANE

4" INTERCONNECT CONDUIT

VARIES, SEE PLANS

TYP.

4"'

TYP.

VARIES

BIKE

LANE

HIGH FRICTION GREEN

BICYCLE PAVEMENT MARKING

10'

TYP.

VARIES

10'

TYP.

10'

TYP.

6" SWLL

6" DWLL(2' MARK, 6' SKIP)

80' MIN.

10'

TYP.

DWBLL

360° VIDEO DETECTION CAMERA

3-25-25

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NOTES:

1. ALL TEMPORARY TRAFFIC CONTROL WORK SHALL CONFORM TO THE LATEST EDITION OF THE

"MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES" (MUTCD) INCLUDING MASSACHUSETTS

AMENDMENTS, UNLESS SUPERCEDED BY THESE PLANS.

2. ALL SIGN LEGENDS, BORDERS, AND MOUNTING SHALL BE IN ACCORDANCE WITH THE MUTCD.

3. TEMPORARY CONSTRUCTION SIGNING AND ALL OTHER TRAFFIC CONTROL DEVICES SHALL BE IN

PLACE PRIOR TO THE START OF ANY WORK.

4. TEMPORARY CONSTRUCTION SIGNING, BARRICADES, AND ALL OTHER NECESSARY WORK ZONE

TRAFFIC CONTROL DEVICES SHALL BE REMOVED FROM THE ROADWAY OR COVERED WHEN

THEY ARE NOT REQUIRED FOR CONTROL OF TRAFFIC.

5. SIGNS AND SIGN SUPPORTS LOCATED ON OR NEAR THE TRAVELED WAY, CHANNELIZING

DEVICES, BARRIERS, AND CRASH ATTENUATORS MUST PASS THE CRITERIA SET FORTH IN

NCHRP REPORT 350, "RECOMMENDED PROCEDURES FOR THE SAFETY PERFORMANCE

EVALUATION OF HIGHWAY FEATURES" AND/OR "MANUAL FOR ASSESSING SAFETY HARDWARE"

(MASH).

6. TEMPORARY PARKING RESTRICTION SIGNS SHALL BE REQUESTED BY THE CONTRACTOR FROM

THE CITY'S PARKING DEPARTMENT AND PLACED AT LEAST TWO BUSINESS DAYS IN ADVANCE OF

THE START OF THE PARKING RESTRICTION.

7. CONTRACTOR SHALL NOTIFY EACH ABUTTER AT LEAST 24 HOURS IN ADVANCE OF THE START OF

ANY WORK THAT WILL REQUIRE THE TEMPORARY CLOSURE OF ACCESS, SUCH AS CONDUIT

INSTALLATION, EXISTING PAVEMENT EXCAVATION, TEMPORARY DRIVEWAY PAVEMENT

PLACEMENT, AND SIMILAR OPERATIONS.

8. THE FIRST TEN PLASTIC DRUMS OF A TAPER SHALL BE MOUNTED WITH SEQUENTIAL FLASHING

LIGHTS.

9. DISTANCES ARE A GUIDE AND MAY BE ADJUSTED IN THE FIELD BY THE ENGINEER.

10. MAXIMUM SPACING OF TRAFFIC DEVICES IN A TAPER (DRUMS OR CONES) IS EQUAL IN FEET TO

THE SPEED LIMIT IN MPH.

11. MINIMUM LANE WIDTH IS TO BE 11 FEET UNLESS OTHERWISE SHOWN. MINIMUM LANE WIDTH TO

BE MEASURED FROM THE EDGE OF DRUMS OR MEDIAN BARRIER.

12. ALL SIGNS SHALL BE MOUNTED ON THEIR OWN STANDARD SIGN SUPPORTS.

DOWNSTREAM TAPER: GUIDES

TRAFFIC BACK TO ITS

ORIGINAL TRAVEL PATH

TERMINATION AREA:

LETS TRAFFIC

RESUME NORMAL

OPERATIONS

ACTIVITY AREA:

WHERE WORK

TAKES PLACE

TRANSITION AREA:

MOVES TRAFFIC

OUT OF ITS

NORMAL PATH

ADVANCE WARNING

AREA: TELLS

TRAFFIC WHAT TO

EXPECT AHEAD

LONGITUDINAL

BUFFER SPACE

LONGITUDINAL BUFFER SPACE:

PROVIDES PROTECTION FOR TRAFFIC

AND WORKERS = STOPPING SIGHT

DISTANCE. NOTHING SHALL BE

PLACED/STORED IN BUFFER SPACE

SHOULDER TAPER: GUIDES

TRAFFIC AWAY FROM

SHOULDER/ BREAK-DOWN LANE

LATERAL BUFFER SPACE:

PROVIDES PROTECTION FOR

TRAFFIC AND WORKERS

TRAFFIC SPACE: ALLOWS

TRAFFIC TO PASS THROUGH

THE ACTIVITY AREA

WORK SPACE: SET ASIDE FOR

WORKERS, EQUIPMENT, AND

MATERIAL STORAGE

W20-SERIES

ROAD

WORK

XXX

THE "A" DISTANCE CAN BE

MEASURED FROM THE START OF

THE TRAVEL LANE RESTRICTION

OR THE SHOULDER/BREAKDOWN

LANE RESTRICTION (IF

SHOULDER/BREAKDOWN LANE IS

ONLY LANE BEING CLOSED)

COMPONENT PARTS OF A TEMPORARY TRAFFIC CONTROL (TTC) ZONE

(FIGURE GEN-4)

NOT TO SCALE

FORMULAS FOR DETERMINING TAPER LENGTHS L = TAPER LENGTH IN FEET

W = WIDTH OF OFFSET IN FEET

S = POSTED SPEED LIMIT, OR OFF-PEAK 85TH-PERCENTILE

SPEED PRIOR TO WORK STARTING, OR THE ANTICIPATED

OPERATING SPEED IN MPH

40 MPH OR LESS

SPEED LIMIT (S) TAPER LENGTH

L (FT)

45 MPH OR MORE

WS²

WHERE:

SOURCE: TABLE 6B-4 2009 MUTCD

WORKZONE DISTANCES

POSTED SPEED (MPH) LENGTH (FT)

30 200

35 250

40 305

TAPER LENGTH CRITERIA FOR TEMPORARY TRAFFIC CONTROL ZONES

MERGING TAPER

TYPE OF TAPER TAPER LENGTH

AT LEAST L

SHIFTING TAPER AT LEAST 0.5 L

SHOULDER TAPER

ONE-LANE, TWO-WAY TRAFFIC TAPER 50 FEET MINIMUM, 100 FEET MAXIMUM

AT LEAST 0.33 L

DOWNSTREAM TAPER 50 FEET MINIMUM, 100 FEET MAXIMUM

NOTE: USE TABLE 6B-4 TO CALCULATE L

SOURCE: TABLE 6B-3 2023 MUTCD

SOURCE: TABLE 6B-2 2023 MUTCD

20 115

45 360

50 425

55 495

60 570

65 645

70 730

75 820

THESE VALUES MAY BE USED TO DETERMINE THE LENGTH OF LONGITUDINAL

BUFFER SPACES.

THE DISTANCES IN THE ABOVE CHART REPRESENT THE MINIMAL VALUES FOR

BUFFER SPACING.

ROAD TYPE TO BE DETERMINED BY MASSDOT OFFICE OF TRANSPORTATION PLANNING.

DISTANCES ARE SHOWN IN FEET. THE COLUMN HEADINGS A, B, AND C ARE THE DIMENSIONS SHOWN IN THE DETAIL/ TYPICAL SETUP FIGURES. THE A DIMENSION IS THE DISTANCE FROM THE TRANSITION OR POINT OF RESTRICTION TO THE FIRST SIGN. THE B DIMENSION IS THE DISTANCE BETWEEN THE FIRST AND SECOND SIGNS. THE C DIMENSION IS THE DISTANCE BETWEEN THE SECOND AND THIRD SIGNS. (THE "THIRD" SIGN IS THE FIRST ONE TYPICALLY ENCOUNTERED BY A DRIVER APPROACHING A

TEMPORARY TRAFFIC CONTROL (TTC) ZONE.)

THE "THIRD" SIGN ABOVE IS TYPICALLY REFERRED TO AS AN "ADVANCE WARNING" SIGN ON THE TTCP SETUPS. THESE ADVANCE WARNING SIGNS ARE LOCATED PRIOR TO THE PROJECT LIMITS ON ALL APPROACHES (i.e. THE W20-1 SERIES (ROAD WORK XX FT) SIGNS), AND USUALLY REMAIN FOR THE DURATION OF THE PROJECT. ADDITIONAL SIGNS (i.e. "RIGHT LANE CLOSED 1 MILE" AND "LEFT LANE CLOSED 1 MILE") HAVE BEEN SHOWN IN SOME FIGURES AS EXAMPLES OF REINFORCEMENT SIGN PLACEMENT BUT ARE

USED IN RARE OCCASIONS.

THE FIRST AND SECOND WARNING SIGNS ABOVE ARE REFERRED TO AS THE OPERATIONAL (DAY-TO-DAY) WORK ZONE SIGNS AND MAY BE MOVED DEPENDING ON WHERE THE SPECIFIC ROADWAY WORK FOR THAT DAY IS LOCATED.

MA-R2-10a SIGNS SHALL BE PLACED BETWEEN THE SECOND AND THIRD SIGNS AS DESCRIBED ABOVE.

MA-R2-10a, MA-R2-10e, AND W20-1 SERIES SIGNS ARE TO BE INCLUDED ON ALL DETAILS/TYPICAL SETUPS.

STOPPING SIGHT DISTANCE AS A FUNCTION OF SPEED

(I.E., UTILITY POLE, TREE, LIGHT POLE)

SIGN MOUNTED ON EXISTING FIXTURE

DIRECTION OF TRAVEL / NUMBER OF TRAVEL LANES OPEN

REFLECTORIZED PLASTIC DRUM WITH SEQUENTIAL FLASHING LIGHT

TYPE III BARRICADE

FLASHING ARROW PANEL

SINGLE SIGN POST

TEMPORARY TRAFFIC CONTROL PLAN LEGEND

TEMPORARY BARRIER

PORTABLE CHANGEABLE MESSAGE SIGN

ACTIVE WORKZONE

P POLICE VEHICLE

TRUCK MOUNTED ATTENUATOR

IMPACT ATTENUATOR

IMPACT ATTENUATOR (DRUMS)

REFLECTORIZED PLASTIC DRUM

SUGGESTED ADVANCE WARNING SIGN MINIMUM SPACING

BASED ON: TABLE 6B-1 2023 MUTCD

ROAD TYPE

DISTANCE

A B C D

URBAN (30 MPH OR LESS) 100 FEET 100 FEET 100 FEET 100 FEET

URBAN (35 MPH OR GREATER) 350 FEET 350 FEET 350 FEET 350 FEET

RURAL 500 FEET 500 FEET 500 FEET 500 FEET

EXPRESSWAY/FREEWAY 1,000 FEET 1,500 FEET 2,640 FEET 500 FEET

B A

WORK

ZONE BUFFER A BL/2DOWNSTREAM

TAPER

100 FT MAX

W5-1

ROAD

NARROWS

W1-4R

W5-1

ROAD

NARROWS

W1-4R W1-4L

L/2

W1-4L

BUFFER

L/3

TWO LANE ROAD SHOULDER AND TRAVEL LANE CLOSED

(FIGURE TLR-2)

RIGHT

SHOULDER

CLOSED

ROAD

NARROWS

100 FT

BUFFER100 FT WORK ZONE A B

W5-1W21-5a L/3

TWO LANE ROAD SHOULDER CLOSED

(FIGURE TLR-1)

NOT TO SCALE

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SCALE IN FEET

20 20 40

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NOTES

1. RETAIN ALL EXISTING SIGNAL EQUIPMENT UNLESS OTHERWISE

NOTED ON THE PLANS.

2. CONTRACTOR IS RESPONSIBLE FOR PULLING WIRE FROM ANY

PROPOSED TRAFFIC SIGNAL EQUIPMENT TO THE NEAREST SOURCE.

3. CONTRACTOR IS RESPONSIBLE FOR VERIFYING EXISTING SIGNAL

CONDUIT HAS SUFFICIENT CAPACITY PRIOR TO PULLING WIRE FROM

ANY PROPOSED SIGNAL EQUIPMENT TO THE NEAREST SOURCE.

4. CONTRACTOR IS RESPONSIBLE FOR TESTING AND VERIFYING ALL

EXISTING EQUIPMENT AND POWER SUPPLIES ARE FUNCTIONING

PROPERLY PRIOR TO INSTALLING NEW SIGNAL EQUIPMENT.

5. POST-MOUNTED 4-INCH BICYCLE SIGNAL INDICATIONS SHALL BE

MOUNTED SUCH THAT THE BOTTOM OF THE SIGNAL HOUSING

(INCLUDING BRACKETS) IS BETWEEN 4 FEET AND 8 FEET HIGH FROM

THE SIDEWALK OR GROUND. POST-MOUNTED 4-INCH BICYCLE

INDICATIONS INSTALLED ABOVE A PEDESTRIAN SIDEWALK OR

PATHWAY SHALL NOT PROJECT MORE THAN 4 INCHES INTO THE

PEDESTRIAN FACILITY.

MAJOR ITEMS REQUIRED - ITEM 816.01

SIGNAL FACES

PHASING DIAGRAM

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SIGNAL FACES

V-023 UCS: align05 VIEW: SHT SV-023

BUS STOP

SCALE IN FEET

20 20 40

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NOTES

1. RETAIN ALL EXISTING SIGNAL EQUIPMENT UNLESS OTHERWISE

NOTED ON THE PLANS.

2. CONTRACTOR IS RESPONSIBLE FOR PULLING WIRE FROM ANY

PROPOSED TRAFFIC SIGNAL EQUIPMENT TO THE NEAREST

SOURCE.

3. CONTRACTOR IS RESPONSIBLE FOR VERIFYING EXISTING

SIGNAL CONDUIT HAS SUFFICIENT CAPACITY PRIOR TO

PULLING WIRE FROM ANY PROPOSED SIGNAL EQUIPMENT TO

THE NEAREST SOURCE.

4. CONTRACTOR IS RESPONSIBLE FOR TESTING AND VERIFYING

ALL EXISTING EQUIPMENT AND POWER SUPPLIES ARE

FUNCTIONING PROPERLY PRIOR TO INSTALLING NEW SIGNAL

EQUIPMENT.

MAJOR ITEMS REQUIRED - ITEM 816.01

PHASING DIAGRAM

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SIGNAL FACES

NOTES

1. THE SIGNAL PHASING SHOWN IN THIS PLAN REFLECTS THE EXISTING CONDITIONS AS MAINTAINED BY THE CITY. THIS

PHASING IS RETAINED BY REQUEST OF THE CITY. THE DESIGNER DOES NOT ASSUME RESPONSIBILITY FOR THE

COMPLIANCE OF THE EXISTING SIGNAL PHASING WITH CURRENT STANDARDS.

R&S EXIST VIDEO EQUIPMENT

PROP INDICATION 8A, 360-DEGREE CAMERA SENSOR

AND ADVANCED BARREL CAMERA SENSOR ON EXIST MAST ARM

PROP INDICATIONS 8B AND 8C ON MAST ARM POLE

WITH 3 FEET MIN VERTICAL SEPARATION PER MUTCD

PROP ATC TRAFFIC SIGNAL CONTROLLER, VIDEO DETECTION PROCESSOR,

TRANSIT SIGNAL PRIORITY SYSTEM AND UPGRADE

EXIST FIRMWARE AS NEEDED TO MEET MBTA SPECIFICATIONS IN EXISTING

TRAFFIC SIGNAL CABINET ON EXISTING FOUDNATION

R&S EXIST VIDEO EQUPMENT

P7 P6

P5 P10

#10

#11

R&R 2 FROM MAST

ARM TO POST

PROP INDICATION

8D ON EXIST TS

POST SEE NOTE 6

P2 #3

#4 P3

SCALE IN FEET

20 20 40

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NOTES

1. ALL EXISTING SIGNAL EQUIPMENT, SIGNS AND PAVEMENT

MARKINGS ARE TO BE RETAINED UNLESS OTHERWISE NOTED.

2. RETAIN ALL EXISTING PAVEMENT MARKINGS AND SIGNAGE

UNLESS OTHERWISE NOTED ON PLAN SHEETS 4 AND 5.

3. CONTRACTOR IS RESPONSIBLE FOR PULLING WIRE FROM ANY

PROPOSED TRAFFIC SIGNAL EQUIPMENT TO THE NEAREST

SOURCE.

4. CONTRACTOR IS RESPONSIBLE FOR VERIFYING EXISTING

SIGNAL CONDUIT HAS SUFFICIENT CAPACITY PRIOR TO

PULLING WIRE FROM ANY PROPOSED SIGNAL EQUIPMENT TO

THE NEAREST SOURCE.

5. CONTRACTOR IS RESPONSIBLE FOR TESTING AND VERIFYING

ALL EXISTING EQUIPMENT AND POWER SUPPLIES ARE

FUNCTIONING PROPERLY PRIOR TO INSTALLING NEW SIGNAL

EQUIPMENT.

6. POST-MOUNTED 4-INCH BICYCLE SIGNAL INDICATIONS SHALL

BE MOUNTED SUCH THAT THE BOTTOM OF THE SIGNAL

HOUSING (INCLUDING BRACKETS) IS BETWEEN 4 FEET AND 8

FEET HIGH FROM THE SIDEWALK OR GROUND. POST-MOUNTED

4-INCH BICYCLE INDICATIONS INSTALLED ABOVE A PEDESTRIAN

SIDEWALK OR PATHWAY SHALL NOT PROJECT MORE THAN 4

INCHES INTO THE PEDESTRIAN FACILITY.

MAJOR ITEMS REQUIRED

PHASING DIAGRAM

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SIGNAL FACES SIGNAL FACES

WASHINGTON

C R

SOMERVILLE

350 ft

SOMERVILLE

300 ft

OFFSET

REFERENCE

O R

G P

O N

D C

PROSPECT

875 ft

Ø2

LPI

Ø6

LPI

Ø8 Ø4

OFFSET

REFERENCE

WEBSTER

1000 ft

BUS

LB/TI

BUS

Ø8

Ø2

Ø9

PED

BUS

LB/TI

Ø2 Ø6

Ø1 & Ø6

Ø4

Ø3

Ø9

PED

Ø4

Ø6

10.0 s

BUS

LB/TI

Ø2

Ø6

Ø1 & Ø6

Ø4

Ø3

6 s

27 s

16 s

23 s

17 s

Ø9

PED

31 s

Ø2

LPI

Ø6

LPI

49 s

33 s

LPI

Ø8

Ø4

38 s

BUS

LB/TI

BUS

Ø8

Ø4

Ø2 Ø6

Ø9

PED

42 s

9 s

46 s

23 s

33 s

38 s

49 s

Ø2

LPI

Ø6

LPI

Ø8 Ø4

33 s

38 s

49 s

BUS

LB/TI

Ø2

Ø6

Ø1 & Ø6

Ø4

Ø3

6 s

27 s

16 s

23 s

17 s

Ø9

PED

31 s

Ø6

LPI

49 s

33 s

LPI

Ø8

Ø4

38 s

6 s

27 s

16 s

23 s

17 s

31 s

OFFSET

REFERENCE

42 s

9 s

46 s

23 s

Ø1

BUS

LB/TI

Ø2

Ø6

Ø1 & Ø6

Ø4

Ø3

Ø9

PED

6 s

27 s

16 s

23 s

17 s

31 s

28.0 s

BUS

LB/TI

BUS

Ø8

Ø4

Ø2 Ø6

Ø9

PED

42 s

9 s

46 s

23 s

BUS

LB/TI

BUS

Ø8

Ø2

Ø9

PED

Ø4

Ø6

42 s

9 s

46 s

23 s

20.9 s

15.7 s

SOMERVILLE

265 ft

44 s

76 sPED

44 s

76 s

PED

20.9 s

15.7 s

10.0 s

T s

SPEED LIMIT =

25 mph

SPEED LIMIT =

20 mph

SPEED LIMIT =

25 mph

SPEED LIMIT =

20 mph

SPEED LIMIT =

25 mph

T s

28.0 s

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UNION SQUARE COORDINATION

PLAN 1 (WEEKDAY MORNING PEAK)

120 SECOND CYCLE

COORDINATED PHASE - GREEN

COORDINATED PHASE - YELLOW/RED

LEGEND:

WASHINGTON STREET

SOMERVILLE AVENUE

EBSTER

AVEN

COORDINATION BAND - SPEED LIMIT

BICYCLE COORDINATION BAND - 15mph

SOMER-

VILLEAVENUE

N O

O N

C O

N D

WASHINGTON

C R

SOMERVILLE

350 ft

SOMERVILLE

300 ft

OFFSET

REFERENCE

PROSPECT

875 ft

Ø2

LPI

Ø6

LPI

Ø8 Ø4

OFFSET

REFERENCE

WEBSTER

1000 ft

BUS

LB/TI

BUS

Ø8

Ø2

Ø9

PED

Ø4

Ø6

BUS

LB/TI

Ø2

Ø6

Ø1 & Ø6

Ø4

6 s

27 s

16 s

17 s

Ø9

PED

31 s

Ø2

LPI

Ø6

LPI

45 s

33 s

LPI

Ø8

Ø4

42 s

BUS

LB/TI

BUS

Ø8

Ø4

Ø2 Ø6

Ø9

PED

35 s

9 s

53 s

23 s

33 s

42 s

45 s

OFFSET

REFERENCE

Ø1

BUS

Ø2

Ø6

Ø1 & Ø6

Ø4

Ø3

Ø9

PED

6 s

27 s

16 s

23 s

17 s

31 s

BUS

LB/TI

Ø2

Ø6

Ø1 & Ø6

Ø4

Ø3

6 s

27 s

16 s

23 s

17 s

Ø9

PED

31 s

LB/TI

BUS

LB/TI

Ø2 Ø6

Ø1 & Ø6

Ø4

Ø3

Ø9

PED

6 s

27 s

16 s

23 s

17 s

31 s

Ø2

LPI

Ø6

LPI

45 s

33 s

LPI

Ø8

Ø4

42 s

35 s

9 s

53 s

23 s

BUS

LB/TI

BUS

Ø8

Ø2

Ø9

PED

Ø4

Ø6

35 s

9 s

53 s

23 s

Ø2

LPI

Ø6

LPI

Ø8 Ø4

33 s

42 s

45 s

BUS

LB/TI

BUS

Ø8

Ø4

Ø2 Ø6

Ø9

PED

35 s

9 s

53 s

23 s

32.0 s

44 s

76 s

PED

44 s

76 s

PED

SOMERVILLE

265 ft

14.0 s

20.9 s

12.6 s

14.0 s

20.9 s

12.6 s

T s

SPEED LIMIT =

20 mph

SPEED LIMIT =

25 mph

SPEED LIMIT =

25 mph

SPEED LIMIT =

25 mph

SPEED LIMIT =

20 mph

23 s

T s

32.0 s

7/ 1/

E P:

- M

- U ni on

S qu ar e, S om er vi lle \C

.0 1_

N S)

dw g

Ph am

, E m ily La st S av ed b y:

Pr in te d by

UNION SQUARE COORDINATION

PLAN 2 (WEEKDAY AFTERNOON PEAK)

120 SECOND CYCLE

WASHINGTON STREET

SOMERVILLE AVENUE

EBSTER

AVEN

SOMER-

VILLEAVENUE

COORDINATED PHASE - GREEN

COORDINATED PHASE - YELLOW/RED

LEGEND:

COORDINATION BAND - SPEED LIMIT

BICYCLE COORDINATION BAND - 15mph

File details come from the government source that posted it. Updated Sep 18, 2026.