Abstract:

In the multimodal transportation system, travel distance is an important factor that influences the traffic mode choice and route choice. Thus considering the influences that travel distance exerted on different perceived costs, a multimodal user equilibrium assignment method was proposed in this paper. Firstly, travel behaviors of travelers in the multimodal transportation system were analyzed. Based on the graph theory, a multimodal supernetwork model for  describing general trip process was constructed, besides the effective hyperpath and the subpath was defined. Secondly, the calculation methods of two main quantitative factors including time and cost in different travel processes were analyzed, and the generalized cost functions of travel were constructed considering the impacts that travel distance exerted on the perceived costs of travelers. Based on these, a multimodal traffic network assignment model based on user equilibrium criterion was proposed, and a shortest path search algorithm based on subpath cost was proposed. Finally, a simple example was applied to validate the model. The results show that the proposed model and algorithm are feasible and effective.

Key words: super network, multimodal, travel distance, user equilibrium