Highlights: Pedestrian-injury severities at pedestrian-vehicle crash hotspots with an annual upward trend are modeled. Spatiotemporal trend analysis is used to identify spatial aggregated pedestrian-vehicle crash hotspots with annual uptrends. Average nearest neighbor and spatial autocorrelation tests are used to give a reference for grid and neighborhood distances. Latent class random parameter logit models are utilized to explore the heterogeneity within and between the subgroups. Contributing factors to the pedestrian-injury severity are identified and analyzed with specific countermeasures.

    Abstract Introduction: With the increasing trend of pedestrian deaths among all traffic fatalities in the past decade, there is an urgent need for identifying and investigating hotspots of pedestrian-vehicle crashes with an upward trend. Method: To identify pedestrian-vehicle crash locations with aggregated spatial pattern and upward temporal pattern (i.e., hotspots with an upward trend), this paper first uses the average nearest neighbor and the spatial autocorrelation tests to determine the grid distance and the neighborhood distance for hotspots, respectively. Then, the spatiotemporal analyses with the Getis-Ord Gi* index and the Mann-Kendall trend test are utilized to identify the pedestrian-vehicle crash hotspots with an annual upward trend in North Carolina from 2007 to 2018. Considering the unobserved heterogeneity of the crash data, a latent class model with random parameters within class is proposed to identify specific contributing factors for each class and explore the heterogeneity within classes. Significant factors of the pedestrian, vehicle, crash type, locality, roadway, environment, time, and traffic control characteristics are detected and analyzed based on the marginal effects. Results: The heterogeneous results between classes and the random parameter variables detected within classes further indicate the superiority of latent class random parameter model. Practical Applications: This paper provides a framework for researchers and engineers to identify crash hotspots considering spatiotemporal patterns and contribution factors to crashes considering unobserved heterogeneity. Also, the result provides specific guidance to developing countermeasures for mitigating pedestrian-injury at pedestrian-vehicle crash hotspots with an upward trend.


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    Titel :

    Exploring pedestrian injury severities at pedestrian-vehicle crash hotspots with an annual upward trend: A spatiotemporal analysis with latent class random parameter approach


    Beteiligte:
    Song, Li (Autor:in) / Fan, Wei (David) (Autor:in) / Li, Yang (Autor:in) / Wu, Peijie (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2020-12-09


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch