A structure model of urban traffic system evolution is built based on the analysis of the factors influencing the system evolution and the hierarchy between the factors.Then the influencing degrees of the factors are quantificationally analyzed by DEMATE(decision making trial and evaluation laboratory).The analysis results indicate that the traffic mode structure which achieves the highest central degree is the dominant influencing factor of the urban traffic system evolution,and that economy development and the traffic policy are the second important factors that also affect the traffic mode structures.Furthermore,physical geography is a basic restriction to the urban traffic system evolution.
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