FINDING ALTERNATIVES TO THE BEST PATH

Abstract

An essential part of many Advanced Traveler Information Systems and Advanced Traffic Management Systems is the path generator. Many existing systems only offer travelers/operators a single alternative -- the "best" path. However, in many situations it is necessary to provide travelers/operators with several alternative paths. In this paper we consider an efficient method for finding such paths and present some initial numerical results that demonstrate the technique's effectiveness. Keywords: ITS, Shortest Paths, Route Guidance, ATIS, ATMS A great number of algorithms have been developed for finding the "best" path through a network, where "best" can be defined in terms of time, cost, distance, or some combination of the three [see (1) for a recent review and evaluation]. Not surprisingly, many of these algorithms have been and are now being used in Advanced Traveler Information Systems (ATIS) and Advanced Traffic Management Systems (ATMS) [see, for example, (2) and (3)]. While thes...

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