In this paper, an improved method for capacity restraint equilibrium model oftraffic assignment is presented by analyzing a traffic situation in China. Firstly, the effects of vehicular load, bicycle load and road geometrical condition are taken into account in an improved road obstruction function. Secondly, the intersection delays are considered to calculate the road-weight (trip time). Thirdly a method for calculating the shortest-path-weight matrix is presented. The capacity restraint model of traffic assignment that has been improved is particularly suited for urban traffic planning and regional highway network planning in China.
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