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The concept of travel trait is introduced to describe travelers' route choice criteria under uncertain environments.The travel trait is defined as the linear weighted sum of the travel time and travel time reliability.Authors integrate two different important factors that have significant impacts on the route choice:the travel time and travel time reliability.Assuming travelers' standard of choosing the path which perceives travel trait cost is minimized due to stochastic variations of link capacities,a stochastic user equilibrium assignment model based on travel trait is formulated.The equivalence and uniqueness of the solution of model are demonstrated.Then,MSA algorithm is cooperated with the model.Numerical results of a small network show that the proposed model can reflect the travelers' route choice behavior in stochastic road networks.
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