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A multi-agent simulation model of urban traffic behavior using Origin-Destination (OD) data and its application to validation of usability of bridges in urban districts are proposed. In this model, inhabitants' behaviors of travel are expressed by a series of decisions of inhabitant agents. They select a series of transportation methods and their routes by optimizing their own utility functions. There are too many candidates in their decisions to calculate in practical time, thus some assumptions and mathematical optimization techniques are applied to reduce calculation time, where route search algorithms of agents are divided into two parts of common and individual. This simulation technique is applied to evaluate the usability of bridges. The evaluation results can be utilized by the administrators of them who judge whether removal of them from the urban district causes inconvenient situations or not. This paper shows some numerical assessment results for a real urban district in Japan by comparing the different OD patterns.
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