scholarly journals Multimodal, multiclass stochastic dynamic traffic assignment for evaluating information provision strategies

2008 ◽  
Vol 42 (1) ◽  
pp. 45-64 ◽  
Author(s):  
Seungjae Lee
Keyword(s):  
Traffic Assignment ◽  
Dynamic Traffic Assignment ◽  
Information Provision ◽  
Stochastic Dynamic ◽  
Dynamic Traffic

Model and algorithm of stochastic dynamic traffic assignment based on dynamic rainfall intensity

2021 ◽  
pp. 1-11
Author(s):  
Xun Ji ◽  
Chunfu Shao
Keyword(s):  
Cost Function ◽  
Traffic Flow ◽  
Rainfall Intensity ◽  
Traffic Assignment ◽  
Dynamic Traffic Assignment ◽  
Dynamic Network ◽  
Travel Cost ◽  
Stochastic Dynamic ◽  
Dynamic Traffic ◽  
Rainy Weather

Frequent occurrence of urban rainy weather, especially rainstorm weather, affects transportation operation and safety, so it is essential that effective intervention measures to recover disordered traffic be adopted and then analyzed for their influence on the dynamic network. Therefore, models and algorithm to show dynamic traffic flow of traffic network in rainy weather are a fundamental need and have drawn great interest from governments and scholars. In this paper, innovative content contains a travel cost function considering rainfall intensity; considering the travel cost function, a dynamic traffic assignment model based on dynamic rainfall intensity is built. Then a corresponding algorithm is designed. Moreover, this study designs three scenarios under rainfall and analyzes the influence of the rainfall on an example network. The results show that rainfall has a significant effect on traffic flow. The finding proved the proposed models and algorithm can express the development trend of path flow rate on a dynamic network under rainfall.

scholarly journals Microscopic Estimation of Road Impedance by Decomposing Traffic Delay into Individual Road Segments: An Analytical Approach

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Jiang Mi ◽  
Yuelong Bai ◽  
Mingbo Luo ◽  
Hui Wang ◽  
Minrui Chen
Keyword(s):  
Traffic Management ◽  
Unsaturated Flow ◽  
Traffic Assignment ◽  
Dynamic Traffic Assignment ◽  
Current Model ◽  
Stochastic Dynamic ◽  
Calculation Error ◽  
Good Precision ◽  
Dynamic Traffic ◽  
Impedance Calculation

Urban road dynamic impedance calculation is the important basis of dynamic traffic assignment and real-time traffic management and control scheme. The current impedance calculation is mostly based on BPR function, and the BPR function is derived from macroscopic statistical laws, in which the microscopic characteristics of traffic flow are insufficiently described. In order to more accurately express the change laws of traffic impedance at the microscopic level, a stochastic dynamic traffic assignment algorithm based on road impedance function is designed to analyze the time impedance of congested roads under random dynamic traffic assignment under different conditions of road network saturation. Compared with the current model, the comprehensiveness and portability are greatly improved. The results show that the impedance calculation error of this method is less than 10% when the load degree of the road is lower than 0.85, which proves that the method has good precision under unsaturated flow conditions.

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