In Florida, the increased use of restrictive medians and directional median openings has generated many U-turns at signalized intersections. There is no widely accepted procedure for estimating the effects of U-turning vehicles on signalized intersection capacity. In the 2000 edition of the Highway Capacity Manual, U-turns are treated as left turns for estimation of saturation flow rates. However, the operational effects of U-turns and left turns are different. This study analyzed the effects of U-turning vehicles on the left-turn saturation flow rate. Data were collected at three signalized intersections in the Tampa Bay area in Florida. In total, the study team recorded the queue discharge times for 260 queues, including 571 U-turning vehicles and 1,441 left-turning vehicles. On the basis of the data collected in the field, a regression model was developed to estimate the relationship between the average queue discharge time for each turning vehicle and the various percentages of U-turning vehicles in the left-turn traffic stream. Adjustment factors for various percentages of U-turning vehicles were also developed by using the regression model. The adjustment factors developed in this study can be directly used to estimate the capacity reduction due to the presence of various percentages of U-turning vehicles at a signalized intersection.


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    Titel :

    Effects of U-Turns on Capacities of Signalized Intersections


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:
    Liu, Pan (Autor:in) / Lu, Jian John (Autor:in) / Fan, Jingjing (Autor:in) / Pernia, Juan C. (Autor:in) / Sokolow, Gary (Autor:in)


    Erscheinungsdatum :

    01.01.2005




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Effects of U-Turns on Capacities of Signalized Intersections

    Liu, Pan / Lu, Jian / Fan, Jingjing et al. | Transportation Research Record | 2005



    U-turns at Signalized Intersections

    N. Stamatiadis / T. Kala / A. Clayton et al. | NTIS | 2004


    Effects of Prohibiting Left-Turns at Signalized Intersections

    P. Habib / W. Thornhill / W. Kaplan | NTIS | 1984


    Operational and Safety Effects of U-Turns at Signalized Intersections

    Carter, Daniel / Hummer, Joseph / Foyle, Robert et al. | Transportation Research Record | 2005