The California PASS Program deployed intelligent traffic signal systems throughout the Bay Area to achieve benefit-to-cost ratios ranging from 12:1 to 105:1.

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

Oakland; California; United States

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.

As a part of each project, traffic counts were collected in the field to understand the traffic patterns and volumes along the corridors. The 7-day 24-hour volume counts (Average Daily Traffic), peak periods turning movement counts, including vehicular, pedestrian, bicycle counts, and historical collision data were then analyzed. Based on the analysis, newly optimized signal timing coordination plans were developed and implemented based on the 2014 California Manual on Uniform Traffic Control Devices (MUTCD) guidelines.

The cumulative results from the 11 projects were as follows:
  • Total Auto Travel Time Savings: 16 percent (over 1.5 million hours)
  • Average Auto Speed Increase: 28 percent
  • Total Auto Fuel Consumption Savings: 12 percent (over 5.2 million gallons)
  • Total Auto Emissions Reduction: 192.4 tons (17.3 tons Reactive Organic Gas, 11.9 tons NOx, 0.7 tons PM2.5, and 162.5 tons CO).
The table below details the individual Projects and their corresponding benefit-to-cost ratios:
#CountyProject Sponsors# of signalsTiming Plans/ServicesB/C Ratios
1Alameda Alameda County, Caltrans12Weekday Peaks20:1
2Contra CostaCity of Antioch, City of Pittsburg, Caltrans10Weekday Peaks34:1
3Contra CostaCity of Concord53Weekday Peaks; School PM Peak; Weekend Peaks46:1
4AlamedaCity of Fremont, Caltrans8Weekday Peaks97:1
5AlamedaCity of Oakland, Caltrans41Weekday Peaks; Weekend Peaks29:1
6San MateoCity of San Bruno, Caltrans15Weekday Peaks12:1
7Contra CostaCity of San Ramon, Caltrans21Weekday Peaks; School PM Peak; Weekend Peaks35:1
8San MateoCity of South San Francisco, Caltrans38Weekday Peaks; Weekend Peaks45:1
9AlamedaCity of Union City, City of Hayward, Caltrans19Weekday Peaks35:1
10Contra CostaCity of Walnut Creek, Caltrans27Traffic Responsive30:1
11Contra CostaCity of Walnut Creek, Caltrans62Weekday Peaks; Weekend Peaks105:1

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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



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Typical Deployment Locations

Metropolitan Areas


coordinated signals, signal coordination, centralized signal control, signal synchronization, traffic signals, advanced signal control, signal timing optimization, coordinated signal control, advanced signal controller, traffic signal retiming, retiming

Benefit ID: 2017-01166