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Heuristic Methods for Calculating Dynamic Traffic Assignment

Abstract : Transport systems are dynamically characterized not only by nonlinear interactions between the different components but also by feedback loops between the state of the network and the decisions of users. In particular, network congestion affects both the distribution of local demand by modifying route choices and overall multimodal demand. Depending on the conditions of the network, they may decide to change for example their transportation mode. Several equilibria can be defined for transportation systems. The user equilibrium corresponds to the situation where each user is allowed to behave selfishly and to minimize his own travel costs. The system optimum corresponds to a situation where the total transport cost of all the users is minimum. In this context, the study aims to calculate route flow patterns in a network considering different equilibrium conditions and study the network equilibrium in a dynamic setting. The study focuses on traffic models capable of representing large-scale urban traffic dynamics. Three main issues are addressed. First, fast heuristic and meta-heuristic methods are developed to determine equilibria with different types of traffic patterns. Secondly, the existence and uniqueness of user equilibria is studied. When there is no uniqueness, the relationship between multiple equilibria is examined. Moreover, the impact of network history is analyzed. Thirdly, a new approach is developed to analyze the network equilibrium as a function of the level of demand. This approach compares user and system optimums and aims to design control strategies in order to move the user equilibrium situation towards the system optimum.
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Submitted on : Friday, February 14, 2020 - 12:17:08 PM
Last modification on : Tuesday, October 20, 2020 - 10:51:58 AM
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  • HAL Id : tel-02479088, version 1



Mostafa Ameli. Heuristic Methods for Calculating Dynamic Traffic Assignment. Dynamique, vibrations. Université de Lyon, 2019. English. ⟨NNT : 2019LYSET009⟩. ⟨tel-02479088⟩



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