The California PASS Program implemented GPS signal communications at 50 traffic signals in San Francisco for $529,484.

The Program for Arterial System Synchronization (PASS) provided technical and financial assistance to Bay Area agencies to help improve the safe and efficient operation of traffic signal systems and corridors.


Summary Information

The Bay Area’s Program for Arterial System Synchronization (PASS) assisted three local counties with retiming their traffic signals to help improve the safe and efficient operation of traffic signal systems and corridors. The program consisted of eleven different projects that encompassed the synchronization of 306 traffic signals.

The PASS project involved the completion of the following major tasks: collect traffic volumes and turning movement counts at all project intersections; analyze traffic data to develop optimized timing plans, implement and fine-tune the recommended timing plans in the field; conduct travel time surveys to analyze the performance measures of the new timing plans; and document the analyses/ findings for the project.

To provide a common time-source for some traffic signals, a total of 50 GPS clocks were installed for four projects in two of the counties. These GPS clocks enabled the signal controllers to regularly synchronize their clocks, efficiently deploy the timing plans at the same time, and thus helped maintain the efficiency of signal coordination.

The table below details the individual Projects that utilized the GPS clocks and their corresponding costs:
Project Sponsors
# of Synchronized Signals
# of GPS Clocks
Timing Plans/Services
Project Cost
1AlamedaCity of Oakland, Caltrans
Weekday Peaks; Weekend Peaks
2San MateoCity of San Bruno, Caltrans
Weekday Peaks
3San MateoCity of South San Francisco, Caltrans
Weekday Peaks; Weekend Peaks
4AlamedaCity of Union City, City of Hayward, Caltrans
Weekday Peaks

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Program for Arterial System Synchronization (PASS) FY 14/15 Cycle - Fact Sheets

Published By: Metropolitan Transportation Commission

Source Date: 01/19/2016


System Cost

Total Project Costs: $529,484


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Roadside Control (RS-C)


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Cost ID: 2017-00383