AN USER-OPTIMAL ROUTE CHOICE MODEL WITH ASYMMETRIC COST FUNCTIONS INCORPORATING INTERSECTION-RELATED TRAVEL TIMES. FINAL REPORT

Abstract

This report describes a traffic assignment model which is innovative in two respects as compared with models conventionally used in practice. First, each turning movement in the street intersections of the network is represented by a travel time-flow relationship; conventional models represent only approach travel times and flows, although turning movements may be accounted for. Second, the travel times for each turning movement are determined as a function of all flows in the intersection as well as the appropriate cycle time and green splits for those flows. Such cost functions are termed asymmetric because of their mathematical properties. In conventional models, each link's travel time depends only on that link's flow. This model is implemented and solved for a small street network for St. Charles, Illinois. To the authors' knowledge, it is the first implementation of such a model with realistic link functions and a real network. The report describes how the link travel time-flow functions were estimated statistically from simulated intersection operations. Then, the experience with the solving model computationally is documented. A lengthy discussion of future research directions concludes the report.

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