The estimation of average delay for vehicles at an intersection by analytic methods is based on queuing theory. Because of the variability of traffic demand over time, the estimation of delays for time-dependent flow and capacity—also with a temporary overload—is of primary interest. For the solution different approximate approaches are currently used in practice. They are based on the approximation of the priority system by an M/M/1 queue and on the so-called coordinate transformation technique developed by Kimber and Hollis. The original approach can be split into nine different cases. The paper investigates the background of these possible solutions and their quality of approximation. The kind of definition for the sum of all delays plays an especially important role. For each of the nine cases, average delay formulas are derived. The complete set of results offers new solutions, especially for the more realistic cases. Thus, initial queues at the beginning of the observed peak period as well as different conditions in the postpeak period can be described. As methods for validating these formulas, numerically exact results could be calculated by Markov chains. Also stochastic simulations and empirical data are used to check the approximate solutions against reality. As a result, a set of equations is recommended that can be applied to estimate average delays at unsignalized intersections for well-defined traffic conditions. These appear to be better fitted to the modeled priority type of intersections than are current approaches.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Delay at Unsignalized Intersections


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:
    Brilon, Werner (Autor:in)


    Erscheinungsdatum :

    01.01.2008




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Delay at Unsignalized Intersections

    Brilon, Werner | Online Contents | 2008


    Delay at Unsignalized Intersections

    National Research Council (U.S.) | British Library Conference Proceedings | 2005


    Delay at Congested Unsignalized Intersections

    Al-Omari, B. H. / Benekohal, R. F. / American Society of Civil Engineers | British Library Conference Proceedings | 1997


    Unsignalized Intersections

    Elefteriadou, Lily | Springer Verlag | 2013