Road Interchange Adaptability

In this paper, different overpass type has been researched. On the basis of forecast model of traffic volume discussing, the mathematic model for the basic parts of road overpass was built up through the research on main mathematical model which suit for overpass in four-stage forecast method. According to the properties and the requirements of the user, by working on the service level, the standard of service level has been defined. The adaptability index of traffic for road overpass was put forward and an adaptability index of traffic system was established. The relative weight of the indexes is determined by multi-person analytic hierarchy process(AHP). The research on traffic capacity of the overpass and the traffic adaptability index indicating the method in this paper are suitable for engineering application by the example in the paper and the method has potentially applied valuation to practical engineering.