A Multi-mode Two-Level Transportation Model Based On Network Vulnerability

Traffic network assignment under road network vulnerability and traffic congestion has become a hot topic for many researchers in recent years. Starting from the complex network characteristics of urban roads and multi-mode traffic network assignment, this paper establishes a multi-mode bilevel transportation model based on network vulnerability which can better reflect different path choice behaviour in a vulnerable network. The upper level is a function of maximizing the capacity of a road network under the investment constraints of the traffic authorities. Its purpose is to minimize the impact of the network operation efficiency and performance after the links or paths are damaged. The lower level is a multi-mode traffic network equilibrium model, which is essentially a traveler behavior assignment problem. Finally, a numerical example is given to demonstrate the effectiveness of the multimodal traffic model based on vulnerability. The analysis results show that the two-level model considering vulnerability index reduces the impact of abnormal events on the performance of road network, and is conducive to the establishment of a more reliable and stable road network.