A computerized signal control system in Los Angeles, California increased average speed by 16 percent, reduced travel time by 18 percent, decreased vehicle stops by 41 percent, and reduced delay by 44 percent.

June 1994
Los Angeles,California,United States

Summary Information

The Automated Traffic Surveillance and Control Program (ATSAC) in Los Angeles, California, has operated computerized signal control systems since 1984. As of 1994, it included 1,170 intersections, and 4509 detectors for signal timing optimization.


The system reportedly reduced vehicle stops 41 percent, reduced travel time 18 percent, increased average speed 16 percent, and decreased delay by 44 percent.

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Automated Traffic Surveillance and Control (ATSAC) Evaluation Study

Published By: Los Angeles DOT

Source Date: June 1994


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Goal Areas


Typical Deployment Locations

Metropolitan Areas


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

Benefit ID: 2000-00106