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The influence of underreported crashes on hotspot identification

Truong, Aaron , Bryden, Giovanni , Chen, Wen , Jia, Xudong , & Washington, Simon (2011) The influence of underreported crashes on hotspot identification. Journal of Transportation of the Institute of Transportation Engineers, 1(1), pp. 19-38.

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    Abstract

    Hot spot identification (HSID) plays a significant role in improving the safety of transportation networks. Numerous HSID methods have been proposed, developed, and evaluated in the literature. The vast majority of HSID methods reported and evaluated in the literature assume that crash data are complete, reliable, and accurate. Crash under-reporting, however, has long been recognized as a threat to the accuracy and completeness of historical traffic crash records. As a natural continuation of prior studies, the paper evaluates the influence that under-reported crashes exert on HSID methods.

    To conduct the evaluation, five groups of data gathered from Arizona Department of Transportation (ADOT) over the course of three years are adjusted to account for fifteen different assumed levels of under-reporting. Three identification methods are evaluated: simple ranking (SR), empirical Bayes (EB) and full Bayes (FB). Various threshold levels for establishing hotspots are explored. Finally, two evaluation criteria are compared across HSID methods.

    The results illustrate that the identification bias—the ability to correctly identify at risk sites--under-reporting is influenced by the degree of under-reporting. Comparatively speaking, crash under-reporting has the largest influence on the FB method and the least influence on the SR method. Additionally, the impact is positively related to the percentage of the under-reported PDO crashes and inversely related to the percentage of the under-reported injury crashes. This finding is significant because it reveals that despite PDO crashes being least severe and costly, they have the most significant influence on the accuracy of HSID.

    Impact and interest:

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    ID Code: 41105
    Item Type: Journal Article
    Additional Information: Item unavailable pending publisher permission
    Keywords: crashes, underreporting
    Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700) > Health Promotion (111712)
    Divisions: Current > Research Centres > Centre for Accident Research & Road Safety - Qld (CARRS-Q)
    Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
    Current > Institutes > Institute of Health and Biomedical Innovation
    Current > Schools > School of Psychology & Counselling
    Copyright Owner: Copyright 2011 Institute of Transportation Engineers
    Deposited On: 05 Apr 2011 12:25
    Last Modified: 22 Jun 2011 05:14

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