道路ネットワークへの投資便益とその測定
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概要
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Construction of a new road will not only create new traffic flows, but also it will change the current of traffic flows using other roads; traffic flows using someroads will decrease and traffic flows in using other roads will increase. Therefore, if we intend to appraise the benefits brought about the road newly constructed, we have to measure the benefits gained from the existing roads as well as from the new road.Regarding methods of measuring the total benefits brought by the new roads, some investigations have been made by many authers, prominently by H. Mohring. Under an assumption that congestion tax is levied, he shows that the total benefit can be measured by summation of the difference of consumers surplus in each roads which were derived by the construction of the new road. However, as he did not consider the structure of road networks concreately, it is not clear how to aggregate these differences. On the other hand, Jara-Diaz and Friesz took up a most simple road network; that is a parallel circuit. They analized the benefits derived from a transportation investment in the network. But their network structure is so simple that the signification of the result from their analysis is limited.In this paper, we will assume rather complicated structure of networks, then we shall measure the benefits from a new road construction on the network structure. We obtain the results that in a parallel circuit the composite supply curve of the two roads is produced by adding the supply curves of the two roads horizontally, and in a sequential circuit the composite supply curve of the two roads is produced by adding the supply curves of the two roads vertically.
- 日本地域学会の論文
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