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Accessibility to a Road Network: Definitions and Applications

J. P. Brans, G. Engelen and L. Hubert
The Journal of the Operational Research Society
Vol. 32, No. 8 (Aug., 1981), pp. 653-673
DOI: 10.2307/2580945
Stable URL: http://www.jstor.org/stable/2580945
Page Count: 21
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Accessibility to a Road Network: Definitions and Applications
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Abstract

In 1953 A. Shimbel proposed definitions of integral and relative accessibility in a network. When this definition of integral accessibility is applied to a detailed route network, it does not give an exact and coherent measure of the accessibility to the territory. Instead of considering the number of edges as a basic measure to calculate the relative accessibility, we use the length of, or the travelling time of, the edges. Moreover, attempts were made to improve the definition in various other ways: (a) by limiting the reference nodes to a hexagonal grid covering the territory regularly; (b) by limiting the reference nodes to the principal towns or cities of economical and social significance; (c) by weighting the relative accessibilities in function of the distance in order to obtain local measures. The accessibility is obtained from the shortest path between nodes of the network. The algorithm of DIJKSTRA was used to obtain all these shortest paths. Computer experiences will be given for the Belgian route network, built up of more than 900 nodes. Automatically plotted geographical maps will be shown for several applications (route, network, relative and integral accessibility, weighted accessibility, location of public facilities, location of distribution centres, evalution of added new routes,...,).

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