Capacity Of Urban Multi-modal Transportation System Considering Generalized Path Overlapping Problem

Under the background of rapid urbanization,more and more cities are confronted with traffic congestion and traffic accidents due to the poor matching between supply and traffic demand.In the existing transportation infrastructure,it is a relatively economic and reasonable way to give full play to the effectiveness of transportation system.Nowadays,the construction of public transportation is in full swing,the capacity urban multi-mode traffic network is the basis of traffic management and control.In the field of network capacity,the existing studies mainly focus on the single model network capacity,such as road network capacity.Therefore,the capacity of the multi-mode traffic network considering transfer behavior is studied in this paper.The multi-mode transportation network is constructed in this paper.Combined with the characteristics of multimode network,the search algorithm of route choice set is given.Based on the stochastic utility theory,the probability of route choice is obtained by modeling the capacity of multi-mode network,and a bi-level programming model is proposed to calculate the capacity.The problem of path overlap is mainly described and the reason why the correlation between route options can’t be considered in MNL model is also explained.Combined with the characteristics of multi-mode network,the concept of generalized path overlap is defined.Based on the theory of stochastic user equilibrium traffic assignment,the network capacity model is established.It can not only consider the problem of transfer behavior,also solved the path overlap problem in multimodal network.According to the characteristics of multimodal transport network carrying capacity model is set up,the solution steps based on genetic algorithm is designed.Finally,the multi-mode transportation network is analyzed based on an example.The effect of the randomness of travelers’ preferences on the variation of the capacity is studied,and the validity of the model considering generalized path overlap is verified.The impact of the transfer costs on the capacity is also explored.The network capacity can be improved by adjusting transfer costs.