Highlights Speed-crash relationships for city streets were investigated by path analysis, taking into account roadway characteristics. A coherent approach jointly modeling multiple relationships among speed, roadway characteristics, and crashes was employed. The analysis identified multiple speed measures of interest that have a statistically significant association with crashes. The key speed measure used in the final analysis – Abs(PSL-Avg) – is intuitive and provided useful interpretation. The results also supported a positive association between speed variability and crash occurrence.

    Abstract Estimating the speed-crash relationship has long been a focus area of interest in roadway safety analysis. Because of many confounding factors that may influence both speeds and crashes, the relationship cannot be appropriately established without considering the corresponding roadway contexts and accounting for their effects on speeds and crashes. This paper investigates the speed-crash relationship for city streets by jointly modeling speed, roadway characteristics, and crashes using a path analysis approach that has been recently introduced into safety analysis while incorporating a wide range of roadway and traffic related variables and additional speed measures. The results from the coherent path analysis identified multiple speed measures of interest that have a statistically significant association with crashes as well as having intuitive and useful interpretation. The results also supported a positive relationship between speed variability and crash occurrence (i.e., larger spread/variability in operational speed is associated with more crashes).


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    Title :

    Exploration of the relationship among roadway characteristics, operating speed, and crashes for city streets using path analysis


    Contributors:


    Publication date :

    2020-11-10




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English







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