Study on Accessibility of Highway Network

Accessibility is one of important indexes to evaluate highway network planning scheme.Due to difference in study purpose and range,the definition and model of accessibility in China and those in foreign countries are different.Using accessibility of highway network as study object,this paper firstly analyzed the influence of highway network nodes' traffic demand,nodes hierarchy and route choice behavior of driver on accessibility,based on which the current accessibility model is improved.The improved model comprehensively considers three factors,that is,nodes' traffic demand,nodes hierarchy and route choice behavior of driver,and the variables are length of shortest path and minimal time between nodes and the degree of importance of node.