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  • Safety Evaluation for Expressways: A Comparative Study for Macroscopic and Microscopic Indicators

    Author(s)
    Qu, Xiaobo
    Kuang, Yan
    Oh, Erwin
    Jin, Sheng
    Griffith University Author(s)
    Oh, Erwin
    Year published
    2014
    Metadata
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    Abstract
    Objective: This article is to assess the performance of 3 macroscopic safety indicators (speed, speed dispersion, and volume) and two microscopic potential crash risks (time to collision and deceleration rate to avoid crash) on safety evaluation for expressways. Methods: Field data were collected at 3 locations for 4 different time periods on an expressway in Beijing, China. The speed of each vehicle, headway time, and vehicle length were recorded by a traffic management system. The 5 safety indicators were thus calibrated on the basis of the collected data. Further, consistency and comparative analyses were applied to ...
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    Objective: This article is to assess the performance of 3 macroscopic safety indicators (speed, speed dispersion, and volume) and two microscopic potential crash risks (time to collision and deceleration rate to avoid crash) on safety evaluation for expressways. Methods: Field data were collected at 3 locations for 4 different time periods on an expressway in Beijing, China. The speed of each vehicle, headway time, and vehicle length were recorded by a traffic management system. The 5 safety indicators were thus calibrated on the basis of the collected data. Further, consistency and comparative analyses were applied to assess the performance of indicators. Results: According to the analyses, speed dispersion was a better predictor of the two microscopic potential risks compared to the two macroscopic indicators. Conclusions: Speed dispersion is recommended to proactively assess road safety because (1) it provides consistent risk evaluation with microscopic potential risks and (2) it makes data collection easier.
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    Journal Title
    Traffic Injury Prevention
    Volume
    15
    Issue
    1
    DOI
    https://doi.org/10.1080/15389588.2013.782400
    Subject
    Automotive engineering
    Transport engineering
    Publication URI
    http://hdl.handle.net/10072/61899
    Collection
    • Journal articles

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