Traffic assignment by paired alternative segments: An Ohio case study

Yucong Hu, David Boyce, Yu Nie, Hillel Bar-Gera

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper examines the performance of a new traffic assignment algorithm, TAPAS, in a case study drawn from transportation planning practice. By identifying and adjusting route and class link flows on pairs of alternative segments, TAPAS is able to converge quickly to the user equilibrium (UE) while finding unique UE route and class link flows, which satisfy a condition of proportionality. The results show that TAPAS achieves more precise solutions compared to a commercial traffic assignment tool based on Frank-Wolfe algorithm, and it generates them with much less computational effort. The case study reveals the project benefit estimated with the TAPAS solution is about 4% lower than that given by the commercial software, which may be large enough to influence decision making. This study provides initial evidence that higher levels of precision, and unique class link flows, may be necessary for certain analyses.

Original languageEnglish
Title of host publicationProceedings of the 17th International Conference of Hong Kong Society for Transportation Studies, HKSTS 2012
Subtitle of host publicationTransportation and Logistics Management
Pages711-717
StatePublished - 1 Dec 2012
Event17th International Conference of Hong Kong Society for Transportation Studies: Transportation and Logistics Management, HKSTS 2012 - Kowloon, Hong Kong
Duration: 15 Dec 201217 Dec 2012

Conference

Conference17th International Conference of Hong Kong Society for Transportation Studies: Transportation and Logistics Management, HKSTS 2012
Country/TerritoryHong Kong
CityKowloon
Period15/12/1217/12/12

Keywords

  • Paired alternative segments
  • Proportionality
  • Traffic assignment
  • User equilibrium

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