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.
Alameda County, California, United States
San Mateo County, California, United States
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:
| # |
County |
Project Sponsors | # of Synchronized Signals | # of GPS Clocks | Timing Plans/Services | Project Cost |
|---|---|---|---|---|---|---|
| 1 | Alameda | City of Oakland, Caltrans |
41 |
32 |
Weekday Peaks; Weekend Peaks |
$219,984 |
| 2 | San Mateo | City of San Bruno, Caltrans |
15 |
5 |
Weekday Peaks |
$53,125 |
| 3 | San Mateo | City of South San Francisco, Caltrans |
38 |
10 |
Weekday Peaks; Weekend Peaks |
$195,250 |
| 4 | Alameda | City of Union City, City of Hayward, Caltrans |
19 |
3 |
Weekday Peaks |
$61,125 |
