IMPROVING TRAFFIC SIGNAL PERFORMANCE AND PRODUCTIVITY WITH IVHS

This paper discusses the integrated operation of systems that use and/or interact with the traffic signal system in a significant way, specifically: a) the signal system itself; b) transit vehicle sharing the right-of-way and affecting the movement of traffic through signalized intersections; and c) dynamic vehicle routing systems, which could benefit from an information exchange with the signal system, and/or provide beneficial demand information to the signal system. This paper describes the following IVHS (Intelligent Vehicle Highway System) developments and outlook for traffic signal optimization, especially in busy networks with significant on-line transit operations: a) modifications to TRANSYT to represent real-time effects; b) the SPPORT model for real-time control using vehicle detection, classification, and queue length measurement. This model can also be used for cost, performance, and benefit analyses of new technologies such as the Road Traffic Microwave Sensor (RTMS); and c) the use of in-vehicle routing information to supplement demand information. For the covering abstract of this conference, see IRRD number 853909. (A)