Understanding travel time uncertainty impacts on individual accessibility

Biyu Chen, Yafei Wang, Donggen Wang, William H.K. Lam, Hui Ping Chen

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

Abstract

Most existing individual accessibility studies ignore travel time uncertainties commonly encountered in congested road networks. This study investigates the impacts of travel time uncertainties on the equity of individual accessibility using spatiotemporal big data collected in Shenzhen, China. The collected big data are utilized to extract travel time distribution information and mobility data of a large number of individual samples across the entire study area. Two reliability-based individual accessibility measures are proposed to evaluate individual accessibility by explicitly considering the individual's reliability constraint in the activity-travel scheduling. The proposed measures are further applied to quantify the travel time uncertainty impacts on individual accessibility to healthy food retailers in Shenzhen. Results of this study suggest that travel time uncertainties have distinct impacts of travel time uncertainties on accessibility of different people groups; and underscore that traditional accessibility measures ignoring travel time uncertainties can lead to significant bias on the evaluation of individual accessibility and associated equity issues.

Original languageEnglish
Title of host publicationTransportation Systems in the Connected Era - Proceedings of the 23rd International Conference of Hong Kong Society for Transportation Studies, HKSTS 2018
EditorsWeihua Gu, Shuaian Wang
PublisherHong Kong Society for Transportation Studies Limited
Pages337-344
Number of pages8
ISBN (Electronic)9789881581471
Publication statusPublished - 1 Jan 2018
Event23rd International Conference of Hong Kong Society for Transportation Studies: Transportation Systems in the Connected Era, HKSTS 2018 - Hong Kong, Hong Kong
Duration: 8 Dec 201810 Dec 2018

Publication series

NameTransportation Systems in the Connected Era - Proceedings of the 23rd International Conference of Hong Kong Society for Transportation Studies, HKSTS 2018

Conference

Conference23rd International Conference of Hong Kong Society for Transportation Studies: Transportation Systems in the Connected Era, HKSTS 2018
Country/TerritoryHong Kong
CityHong Kong
Period8/12/1810/12/18

Keywords

  • Accessibility Equity
  • Individual Accessibility
  • Social Exclusion
  • Spatiotemporal Big Data
  • Travel Time Uncertainty

ASJC Scopus subject areas

  • Transportation

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