United States Department of Transportation
i
Evaluation of the Optimized Policies for Adaptive Control Strategy
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1989-05-01
[PDF-1.82 MB]
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Abstract:The OPAC strategy is an on-line traffic signal control algorithm designed to optimize the performance of traffic signals at isolated intersections using delay as the performance criterion. OPAC-RT is a traffic signal control system which implements the OPAC strategy in real time. The system uses traffic data collected from detectors located well upstream (400 to 600 ft) of the stop bar on all approaches to an intersection. Optimum signal timing is determined using minimum and maximum green constraints and does not require a fixed cycle length. This report describes three field tests of the on-line OPAC strategy. The results indicate that OPAC performs better than well timed actuated signals, particularly at greater demand levels.
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