This paper presents the results of an evaluation of the flashing yellow arrow (FYA) treatment using data from signalized intersections in Nevada, North Carolina, Oklahoma, and Oregon. The evaluation method was an empirical Bayes before–after analysis. The treatments were divided into seven categories depending on the phasing system in the before period (permissive, protected–permissive, or protected), phasing system in the after period (FYA permissive or FYA protected–permissive), the number of roads where the FYA was implemented (one road or both roads), and the number of legs at the intersections (three or four). The first five treatment categories involved permissive or protected–permissive phasing in the before period. Intersections in these five treatment categories experienced a reduction in the primary target crashes under consideration: left turn crashes and left turn with opposing through crashes. The reduction ranged from 15% to 50%, depending on the treatment category. Intersections that had at least one protected left turn phase in the before period and had FYA protected–permissive left turn phase in the after period experienced an increase in left turn crashes and left turn with opposing through crashes, indicating that replacing a fully protected left turn with FYA will likely cause an increase in left turn crashes.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Crash Modification Factors for the Flashing Yellow Arrow Treatment at Signalized Intersections


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2018-07-07




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Safety Effectiveness of Flashing Yellow Arrow

    Simpson, Carrie L. / Troy, Shawn A. | Transportation Research Record | 2019


    Crash Estimation at Signalized Intersections

    Wang, Xuesong / Abdel-Aty, Mohamed / Brady, Patrick A. | Transportation Research Record | 2006


    Crash Patterns at Signalized Intersections

    Polders, Evelien / Daniels, Stijn / Hermans, Elke et al. | Transportation Research Record | 2015


    Right-Angle Crash Occurrence at Signalized Intersections

    Wang, Xuesong / Abdel-Aty, Mohamed | Transportation Research Record | 2007