Examining the effectiveness of variable speed limit from a long-term equilibrium perspective with empirical data

W. Liu, Yafeng Yin, Hai Yang, F. Zhang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

This paper examines the effectiveness of variable speed limits (VSLs) on improving traffic flow efficiency in a stylized setting of morning commute where a fixed number of individuals commute from home to work through a single bottleneck. We consider a VSL system installed along the freeway towards the bottleneck, which adjusts commuters' cruising speeds in a discrete fashion and essentially regulates the upstream flow into the bottleneck. By investigating the departure-time equilibrium under the proposed VSL system, we establish conditions for the system to improve various performance measures and bound its efficiency. Based on empirical data, we conclude that the proposed VSL system can avoid or delay capacity drop associated with an active bottleneck and thus reduce queuing delay. It can help reduce the schedule delay cost. However, it is unlikely for the VSL system to reduce total travel time, individual travel cost in this particular setting.

Original languageEnglish
Title of host publicationProceedings of the 19th International Conference of Hong Kong Society for Transportation Studies, HKSTS 2014 - Transportation and Infrastructure
EditorsZ. Leng, Y. H. Wang
PublisherHong Kong Society for Transportation Studies Limited
Pages433-440
Number of pages8
ISBN (Electronic)9789881581433
Publication statusPublished - Dec 2014
Externally publishedYes
Event19th International Conference of Hong Kong Society for Transportation Studies: Transportation and Infrastructure, HKSTS 2014 - Hong Kong, China
Duration: 13 Dec 201415 Dec 2014

Publication series

NameProceedings of the 19th International Conference of Hong Kong Society for Transportation Studies, HKSTS 2014 - Transportation and Infrastructure

Conference

Conference19th International Conference of Hong Kong Society for Transportation Studies: Transportation and Infrastructure, HKSTS 2014
Country/TerritoryChina
CityHong Kong
Period13/12/1415/12/14

Keywords

  • Bottleneck
  • Capacity drop
  • Morning commute
  • Variable speed limits

ASJC Scopus subject areas

  • Transportation

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