Highlights ► In Shanghai, the road network density is relatively high and the distance between signalized intersections is small. ► Adjacent signalized intersections located along the same corridor share similar traffic flows, and signals are usually coordinated. ► Mean speeds and speed variances of corridors were acquired from taxis equipped with Global Positioning Systems (GPS). ► Bayesian hierarchical models were applied to identify crash risk factors at both the intersection and the corridor levels. ► Intersections along corridors with lower mean speeds were associated with fewer crashes than those with higher speeds.

    Abstract Most traffic crashes in Chinese cities occur at signalized intersections. Research on the intersection safety problem in China is still in its early stage. The recent development of an advanced traffic information system in Shanghai enables in-depth intersection safety analyses using road design, traffic operation, and crash data. In Shanghai, the road network density is relatively high and the distance between signalized intersections is small, averaging about 200m. Adjacent signalized intersections located along the same corridor share similar traffic flows, and signals are usually coordinated. Therefore, when studying intersection safety in Shanghai, it is essential to account for intersection correlations within corridors. In this study, data for 195 signalized intersections along 22 corridors in the urban areas of Shanghai were collected. Mean speeds and speed variances of corridors were acquired from taxis equipped with Global Positioning Systems (GPS). Bayesian hierarchical models were applied to identify crash risk factors at both the intersection and the corridor levels. Results showed that intersections along corridors with lower mean speeds were associated with fewer crashes than those with higher speeds, and those intersections along two-way roads, under elevated roads, and in close proximity to each other, tended to have higher crash frequencies.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Corridor-level signalized intersection safety analysis in Shanghai, China using Bayesian hierarchical models


    Contributors:
    Xie, Kun (author) / Wang, Xuesong (author) / Huang, Helai (author) / Chen, Xiaohong (author)

    Published in:

    Publication date :

    2012-10-11


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English







    Modeling signalized intersection safety with corridor-level spatial correlations

    Guo, Feng / Wang, Xuesong / Abdel-Aty, Mohamed A. | Elsevier | 2009


    Safety Based Signalized Intersection Level of Service

    Pan, F. / Lu, J. / Xiang, Q. et al. | British Library Conference Proceedings | 2008