Measuring place-based accessibility under travel time uncertainty

Travel time uncertainty has significant impacts on individual activity-travel scheduling, but at present these impacts have not been considered in most accessibility studies. In this paper, an accessibility evaluation framework is proposed for urban areas with uncertain travel times. A reliable spac...

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Bibliographic Details
Published in:International journal of geographical information science : IJGIS 2017-04, Vol.31 (4), p.783-804
Main Authors: Chen, Bi Yu, Yuan, Hui, Li, Qingquan, Wang, Donggen, Shaw, Shih-Lung, Chen, Hui-Ping, Lam, William H. K.
Format: Article
Language:English
Subjects:
Accessibility
Case studies
Geographic information science
Place-based accessibility
Reliability
Reliability analysis
Scheduling
service area analysis
Tracking
Transportation planning
Travel
Travel time
travel time uncertainty
Uncertainty
Urban areas
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Summary:Travel time uncertainty has significant impacts on individual activity-travel scheduling, but at present these impacts have not been considered in most accessibility studies. In this paper, an accessibility evaluation framework is proposed for urban areas with uncertain travel times. A reliable space-time service region (RSTR) model is introduced to represent the space-time service region of a facility under travel time uncertainty. Based on the RSTR model, four reliable place-based accessibility measures are proposed to evaluate accessibility to urban services by incorporating the effects of travel time reliability. To demonstrate the applicability of the proposed framework, a case study using large-scale taxi tracking data is carried out. The results of the case study indicate that the proposed accessibility measures can evaluate large-scale place-based accessibility well in urban areas with uncertain travel times. Conventional place-based accessibility indicators ignoring travel time reliability can significantly overestimate the accessibility to urban services.
ISSN:1365-8816
1362-3087
1365-8824
DOI:10.1080/13658816.2016.1238919