|Table of Contents|

Urban traffic assignment model based on mean-excess travel time and bounded rationality(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年3期
Page:
125-137
Research Field:
交通工程
Publishing date:

Info

Title:
Urban traffic assignment model based on mean-excess travel time and bounded rationality
Author(s):
LI Jie;  ZHANG Meng-jia;  CHEN Si-yu
(College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)
Keywords:
traffic engineering;  traffic assignment;  bounded rationality;  mean-excess travel time;  urban road network;  subjective and objective uncertainty
PACS:
U491
DOI:
10.19721/j.cnki.1671-8879.2024.03.011
Abstract:
An agent-based traffic assignment model of the urban road network was established torefine current traffic assignment methods, considering the influence of uncertain factors of theroad network and travelers on random travel behavior. Firstly, the concept of mean-excess traveltime was employed to encapsulate the objective uncertainty of travel time in the road network.The travel cost function under the condition of random capacity degradation was constructed.Then the bounded rationality theory was used to describe travelers' subjective uncertainty, considering the updating process of travelers' perception of route cost. The route decisionalgorithm was determined by combining the Logit formula. Subsequently, the stochastic roulettealgorithm was used to generate travelers' daily travel choices, and the urban traffic assignmentmodel was constructed. Finally, the established model was applied to the dual-route, nine-point,and Sioux-Falls networks to analyze model advantages and the influence of parameter changes onthe network performance. The results show that the number of days required for the road networkto reach stability increases with the enhancement of road network degradation degree, travelers'sensitivity to cost differences and experiential learning ability. The total cost of the road networkunder stable conditions increases with the increase of road network degradation degree andtravelers' requirement for travel time reliability. Pursuing individual travel time reliability canexpand the network's total cost under stable conditions because the higher the reliability, the morebuffer time. The more severe the degradation of the road network, the more noticeable this lift is,as the excess time also increases. Compared to the UE, BR and METT models, the establishedmodel considers both subjective and objective uncertainties can effectively overcome thelimitation of traditional models, such as underestimating the traffic on a long route, making theresults more accurate. Moreover, the proposed model is suitable for assigning traffic to the largeurban road network. Its parameters regarding uncertainty can be changed by formulating relevanttraffic management policies to alleviate traffic congestion and improve the overall operatingefficiency of the road network.2 tabs, 10 figs, 24 refs.

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Last Update: 2024-05-01