Title: RAMP CONTROL TO RELIEVE FREEWAY CONGESTION CAUSED BY TRAFFIC DISTURBANCES
Abstract: SYSTEMS HAVE BEEN INSTALLED IN SEVERAL CITIES IN THE UNITED STATES, INCLUDING LOS ANGELES, WHICH ALLOW THE CONTROL OF RAMP SIGNAL LIGHTS FROM A CENTRAL LOCATION. TIME-OF-DAY RAMP VOLUME SCHEDULES HAVE BEEN USED WITH SOME SUCCESS. THIS PAPER EXAMINES A CLASS OF TRAFFIC-RESPONSIVE RAMP CONTROL ALGORITHMS FOR ADJUSTING RAMP VOLUMES IN RESPONSE TO TRAFFIC DISTURBANCES, E.G., CONGESTION RESULTING FROM LANE BLOCKAGES. A LARGE NUMBER OF TRAFFIC-RESPONSIVE RAMP CONTROL PLANS ARE CONSIDERED. EACH PLAN IS EVALUATED IN TERMS OF FREEWAY SERVICE (VEHICLE-MILES) AND DELAY (VEHICLE-HOURS) OVER A FIXED CONTROL PERIOD BY SIMULATING THE RESPONSE OF TRAFFIC TO A LANE BLOCKAGE ON A MACROSCOPIC MODEL OF FREEWAY TRAFFIC. THE RESULT OF THE ANALYSIS IS A SET OF RAMP CONTROL PLANS, EACH OF WHICH YIELDS MINIMUM DELAY FOR A SPECIFIED LEVEL OF FREEWAY SERVICE. THE PERFORMANCE MEASURES ASSOCIATED WITH THESE PLANS ARE PLOTTED AGAINST ONE ANOTHER, YIELDING A TRADE-OFF CURVE FOR FINAL SELECTION OF A RAMP METERING PLAN.
Publication Year: 1973
Publication Date: 1973-01-01
Language: en
Type: article
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Cited By Count: 15
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