20260810 - Signal Plans - Warren St.pdf
PDF 122 KB Posted
- Attached to
- IFB 115-26 Transit Signal Priority Project
- Solicitation number
- BD-27-1206-40000-40000-132413
- Issued by
- Middlesex County, Massachusetts
About this file
This file is a signal timing plan document for the intersection of Somerville Avenue and Warren Avenue in Somerville, Massachusetts, related to the IFB 115-26 Somerville Union Square Transit Signal Priority Project. The document contains technical signal timing parameters and coordination data for the traffic signal installation at this location. The plan specifies signal phase timing, pedestrian walk intervals, clearance intervals, and detector assignments. Key timing values include minimum green times of 10 seconds for certain phases, yellow intervals of 10 seconds, red intervals of 20 seconds, pedestrian walk times of 8 seconds, and pedestrian clearance times of 40 seconds. The document also indicates coordination operation modes and preemption parameters necessary for transit signal priority functionality at this intersection.
The signal plan reflects the technical specifications required for implementation of the transit signal priority system as part of the larger Somerville Union Square Transit Signal Priority Project. The document was generated on August 12, 2026, and appears to be extracted from a spreadsheet-based signal timing database. This plan would serve as the design basis for traffic signal contractors implementing or modifying the signal control system to accommodate transit vehicle priority, allowing buses to extend green phases or call green phases as needed to improve transit operations through the intersection.
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Text version
Φ1 Φ2 1 2 3 6 SEC
10 1 1 2 3 20 TSEC
40 10 - - - NO
40 1 0 0 0 NO
40 1 0 0 0 0
30 40 0 0 0 0
20 10 0 0 0 FL
0 0 1 1 1
0 0 1 1 1
MAX NONE 1 1 1 1,2,3,4
0 0 0 0 0 5,6,7,8
0 7 0 0 0 0,0,0,0
0 11 0 0 0 0,0,0,0
0 0 255 255 255
0 0 0 0 0
NONE NA FRE
0 0 PRM
YEL INACT MX2 PLAN DATA
NONE NONE DWL
BEG
PLN
10 0
10 0
SELECT TRACK RETURN NOTES
GREEN 10
PED CLR 8 8 8
YEL/10 40 40 40
RED/10 20 20 20
SELECT TRACK RETURN
GREEN 10
PED CLR 8 8 8
YEL/10 40 40 40
RED/10 20 20 20
PREEMPT 2 INTERVAL TIMES
MIN GRN
MIN WLK
DWL GRN
OFFSET
FORCE
MAX DWELL
YIELD PERIOD
MIN GRN
MIN WLK
DWL GRN
PREEMPT 1 INTERVAL TIMES
COORDINATION
OPERATION
MODE
MAX
CORRECTION
QLIMIT
DETECTION
STARTUP TIME
RED REV/10
AUTO PED CLR
STOP T RESET
ALT SEQUENCE
SPECIAL SEQ
STATE
STARTUP
SEQUENCE
R1
R2
R3
R4
SIGNAL TIMING
Detector
Assigned phases
Switch phases
MODE
VOLUME
OCCUPY
LOCK
CALL
PASS
ADDED
QUEUE
EXT/10
DLY/10
FAIL
Somerville Ave @ Warren Ave
Phase
RED/10
YEL/10
MAX # 2
MAX # 1
PASS/10
DMAX
DSTP/10
VEH RCL
MIN GRN
VEH DLY
WALK1
PEDCLR1
WALK2
PEDCLR2
PED RCL
PED DLY
INITIAL
NA RESP
20260810 - Signal Plans - Warren St.xlsx Printed on 8/12/2026 Page 1 of 1
File details come from the government source that posted it. Updated .