Serving protected left-turn phases for one or two vehicles can often be an inefficient use of cycle green time when the opposing through movements are over capacity. This paper assesses the performance of an intersection at which controller logic is applied to delay the call for a protected left-turn phase on the basis of vehicle wait times. During four weeks of evaluation, the delay on left-turn phase calls was varied in 25-s increments from 0 to 75 s. The results indicate that delaying left-turn phase initiation substantially increases the amount of green time for saturated through movements while minimally increasing the travel delay for left-turning drivers. The recommendation is made for agencies to consider using a delay in the range of 25 to 50 s for calling protected phases at intersections at which the opposing through movement is oversaturated and could benefit from additional green time. This paper presents one of the first quantitative studies evaluating potential intersection capacity and performance improvements with respect to left-turn detector delay.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Improving Intersection Behavior through Delay-Based Left-Turn Phase Initiation


    Additional title:

    Transportation Research Record




    Publication date :

    2014-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Improving intersection performance with left turn phase reservice strategies

    Corey, Jonathan / Xin, Xin / Lao, Yunteng et al. | IEEE | 2012


    Personified left-turn intersection decision-making method

    GUAN XIN / CAI LEI / JIA XIN et al. | European Patent Office | 2023

    Free access

    The Applicability of Displaced Left-Turn Intersection

    Pan, Binghong / Ying, Jinfeng | ASCE | 2020


    Left-Turn Gap Acceptance Behavior of Tee Type of Unsignalized Intersection

    Zhong, Xiaoming / Zhu, Xinzheng / Zhang, Yong et al. | ASCE | 2007


    Left-Turn Gap Acceptance Behavior of Tee Type of Unsignalized Intersection

    Zhong, X. / Zhu, X. / Zhang, Y. et al. | British Library Conference Proceedings | 2007