The current model used in the United States to predict approach capacity at a single-lane roundabout uses information about entry driver behavior in response to the circulating traffic stream only. There is no procedure for including exiting vehicles in capacity estimation. Exiting vehicles are vehicles that leave the circulating stream of traffic by maneuvering into the exit lane at a roundabout approach. Exiting vehicles are known to have an effect on capacity at roundabout approaches in other countries, but their effect in the United States is not known. The purpose of this research is to determine whether including exiting vehicles improves capacity estimation at a roundabout approach. An exploration of the relationships of the proportion of exiting vehicles and the width of the splitter island to approach capacities is included. Capacities were estimated both with and without exiting vehicles as part of the conflicting flow and compared with measured field capacities. The findings demonstrate that capacity estimates with exiting vehicles result in improved prediction of the actual capacity of a roundabout approach over estimates without exiting vehicles. The proportion of exiting vehicles in the major stream and the width of the splitter island appear to provide some benefit in capacity prediction, but exactly how these parameters can be incorporated into the capacity prediction process must be further explored.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Including Exiting Vehicles in Capacity Estimation at Single-Lane U.S. Roundabouts


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2006-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Including Exiting Vehicles in Capacity Estimation at Single-Lane U.S. Roundabouts

    Mereszczak, Y. / Dixon, M. / Kyte, M. et al. | British Library Conference Proceedings | 2006


    Including Exiting Vehicles in Capacity Estimation at Single-Lane U.S. Roundabouts

    Mereszczak, Yuri / Dixon, Michael / Kyte, Michael et al. | Transportation Research Record | 2006



    Impact of Including Exiting Vehicles in Single-Lane Roundabout Capacity Models

    Suh, Wonho / Barry, Christina / Schmitt, Laura et al. | Transportation Research Record | 2019


    Capacity of Single-Lane Roundabouts with Slow Traffic

    Leeuw, Martijn A.M.de | Online Contents | 1999