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Systems have been installed in several cities in the United States, including Los Angeles, Calif., which allow real-time surveillance and control of freeway traffic. The surveillance function is effected by a system of presence detectors located on the freeways, telemetry, and digital computer processing. Traffic control is effected by using traffic signals to meter traffic entering the freeway through on-ramps. Current research on modeling freeway traffic flow, estimation of traffic conditions from presence-detector data, and control of freeway traffic is utilized to provide a design of a surveillance and control system for a segment of the Hollywood Freeway in Los Angeles. In some aspects of the design, particularly the design of traffic-responsive on-ramp metering algorithms, a sound theoretical foundation which adequately accounts for practical constraints has been established. In other areas, preliminary ideas are presented and approaches to optimal schemes outlined.
Systems, Man and Cybernetics, IEEE Transactions on (Volume:SMC-3 , Issue: 3 )
Date of Publication: May 1973