The Research On Traffic Assignment Model For Multi-user Multi-mode Travel Network

With the rapid development of multi-mode transportation system,a variety of new types of transportation appear in our daily life.Travelers thus have more options and they can choose one or more types of transportation according to their practical needs.With the increase of types of transportation,the travel mode of residents increases,and the travel paths including different travel modes will also increase.Based on the construction of multi-mode traffic network,this paper categorizes travelers,analyzes the impact of travel preferences of different types of travelers on the generalized travel costs,studies travelers’ behavior of route choices,establishes a stochastic user equilibrium assignment model under the multi-user and multi-mode traffic network,and solves the model.The improvement of multi-mode traffic system results in a more and more complex traffic network.Nodes and arc segments in the sub network of different travel modes have different attributes.This paper analyzes the multi-mode traffic network and describes the topology of multi-mode traffic network.On this basis,by analyzing the travel modes and travelers’travel behavior,setting constraints on reasonable travel behavior in multi-mode traffic network,the feasible path and effective path of multi-mode traffic are defined,and the effective path search algorithm based on breadth first search algorithm is designed.Considering the influence of travel preference and travel information on travelers’ choice behavior,travelers are divided into four categories:information travelers with preference for public transport,experience travelers with preference for public transport,information travelers with preference for private car,and experience travelers with preference for private car.This paper analyzes the travel time,costs and comfort loss of each segment under the sub network of different travel modes,studies the generalized travel costs of different types of users under the sub network of each travel mode,and constructs the corresponding function of generalized travel cost for different types of user in multi-mode traffic network.Based on the multi-mode traffic network and generalized travel costs,the route choice of travelers and the multi-mode traffic assignment to different types of users are studied.Taking the minimum generalized travel costs as the standard for route selection,the probability model of route selection is established.Based on this probability model,the stochastic user equilibrium assignment model in multi-user multi-mode transportation network is established by using the stochastic user equilibrium principle.The Lagrange function is constructed to prove its equivalence.The model is solved based on the successive average algorithm(MSA).A multi-mode traffic network example is designed to verify the effectiveness and accuracy of the proposed model and algorithm.