Based on the survey data of three signalized intersections with exclusive triple left-turn lane and with outside trap lane in Beijing, traffic flow characteristics of left-turns are studied by using statistical methods. It shows that the discharge headway and saturation flow rate of exclusive triple left-turn lane with outside trap lane divides into two stages when the discharge time of vehicles in the left-turn bay is less than the left-turn green time. This problem is uncharted in the Highway Capacity Manual (HCM). This research analyzes the effects of relationship between the length of left-turn bay and green time on the left-turn capacity. A theoretic model for left-turn capacity is developed by considering this characteristic. The developed capacity model will be validated on the basis of VISSIM simulations of a real-world signalized intersection. And the results demonstrate that the proposed capacity models well estimate the left-turn capacity at signalized intersections in the case, which the length of left-turn bay and green time is not well optimized and well reflect the capacity loss due to the transitional area bottleneck.


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    Title :

    Study on Capacity for Exclusive Triple Left-Turn Lanes with Outside Trap Lane at Signalized Intersections


    Contributors:
    Zong, Erkai (author) / Shao, Changqiao (author) / Yang, Chao (author) / Bai, Miao (author) / Liu, Liqin (author)

    Conference:

    The Twelfth COTA International Conference of Transportation Professionals ; 2012 ; Beijing, China


    Published in:

    CICTP 2012 ; 434-447


    Publication date :

    2012-07-23




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English





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