Abstract
The purpose of this paper is to propose an evaluation method for measuring performance levels of alternate routes on highway networks. A mathematical model, called “Redundancy Index”, is defined between given pairs of nodes. It is intended to indicate the performance levels of alternate routes which are used when some part of the highway network is damaged. An efficient algorithm is developed for its computation. Empirical studies are presented by applying this index to regional highway networks in Hokkaido and Yamaguchi prefecture and the applicability of this method is described.
