A newly proposed unconventional intersection design, exit lanes for left-turn (EFL) intersections, has been demonstrated to be very promising for capacity improvement. However, the difference in saturation flow rates at EFL intersections compared with conventional intersections and the influencing factors remain unknown. In this paper, a saturation flow rate adjustment model for EFL control is developed and calibrated based on field data. Five influencing factors, namely the median opening blockage, demand starvation, multilane interference, conflict with opposing vehicles, and lane changing, are considered. The accuracy of the model is validated using nonparametric tests. Results show that the reduction in saturation flow rate for the normal approach left-turn lanes, the left-turn lanes in the mixed-use area, and the left-turn lane at the prestop line caused by EFL control are 6%, 31%, and 19%, respectively. The key impact factors for the saturation flow rate at the main-stop line and the prestop line are the demand starvation (16% reduction) and lane changing (16% reduction), respectively. This research provides guidelines for planning, design, and operation of EFL intersections to prevent negative effects while retaining their efficiency.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Saturation Flow Models of Exit Lanes for Left-Turn Intersections


    Contributors:
    Zhao, Jing (author) / Yu, Jie (author) / Zhou, Xizhao (author)


    Publication date :

    2018-12-31




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Saturation flow rates for dual left-turn lanes

    Kagolanu, K. / Szplett, D. / Transportation Research Board; Committee on Highway Capacity and Quality of Service et al. | British Library Conference Proceedings | 1994


    Lengths of Left-Turn Lanes at Signalized Intersections

    Kikuchi, Shinya | Online Contents | 1993


    Lengths of Left-Turn Lanes at Unsignalized Intersections

    Chakroborty, Partha | Online Contents | 1995


    Signal timing optimization of exit lanes for left-turn intersections considering emission and delay

    Zhang, Shaohua / Liu, Yugang / Wan, Qing et al. | British Library Conference Proceedings | 2023