Reliable Space-Time Prisms Under Travel Time Uncertainty

Bi Yu Chen, Qingquan Li, Donggen Wang, Shih Lung Shaw, William H.K. Lam, Hui Yuan, Zhixiang Fang

    Research output: Contribution to journalJournal articlepeer-review

    78 Citations (Scopus)

    Abstract

    Time geography is a powerful framework for analyzing human activities under various space-time constraints. At the core of time geography is the concept of the space-time prism, which delimits an individual's potential activity locations in space and time. The classical space-time prism, however, admits only deterministic travel speeds and ignores the stochastic nature of travel environments. In this article, the classical space-time prism model is extended to congested road networks with travel time uncertainty. A reliable space-time prism is proposed to consider explicitly an individual's on-time arrival probability concerns in the face of travel time uncertainty. The reliable space-time prism is defined as the set of space-time locations where an individual can participate in an activity and return to his or her destination with a given on-time arrival probability. To construct such a reliable space-time prism in a road network, a solution algorithm is developed. A case study using real-world traffic information is carried out to demonstrate the applicability of the proposed prism model. The results of the case study indicate that the proposed prism model can represent well individuals' space-time taking into account various on-time arrival probability concerns.

    Original languageEnglish
    Pages (from-to)1502-1521
    Number of pages20
    JournalAnnals of the Association of American Geographers
    Volume103
    Issue number6
    DOIs
    Publication statusPublished - Nov 2013

    User-Defined Keywords

    • reliability
    • reliable space-time prism
    • time geography
    • travel behavior
    • travel time uncertainty

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