Sags are freeway sections along which the gradient changes significantly from downward to upward. The capacity of sags is considerably lower than the capacity of normal sections. Consequently, sags are often freeway bottlenecks. Recently, several control measures have been proposed to improve traffic flow efficiency at sags. Those measures generally aim to increase the capacity of the bottleneck, to prevent traffic flow perturbations in nearly saturated conditions, or both. This paper presents an alternative type of measure based on the concept of mainstream traffic flow control. The proposed control measure regulates traffic density at the bottleneck area to keep it below the critical density and hence prevent traffic from breaking down while maximizing outflow. Density is regulated by means of a variable speed limit section that regulates the inflow to the bottleneck. Speed limits are selected on the basis of a feedback control law. The authors evaluate the effectiveness of the proposed control strategy by means of a simple case study by using microscopic traffic simulation. The results show a significant increase in bottleneck outflow, particularly during periods of high demand, which leads to a considerable decrease in total delay. This finding suggests that mainstream traffic flow control strategies that use variable speed limits have the potential to improve substantially the performance of freeway networks containing sags.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Mainstream Traffic Flow Control at Sags


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:


    Erscheinungsdatum :

    03.03.2019




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Modeling Traffic at Sags

    Goñi Ros, B. / Knoop, V. L. / Shiomi, Y. et al. | British Library Online Contents | 2016


    Modeling Traffic at Sags

    Goñi Ros, Bernat / Knoop, Victor L. / Shiomi, Yasuhiro et al. | Springer Verlag | 2014


    Optimal mainstream traffic flow control of motorway networks

    Carlson, Rodrigo C. / Papamichail, Ioannis / Papageorgiou, Markos et al. | Tema Archiv | 2009


    Optimal mainstream traffic flow control of large-scale motorway networks

    Lawphongpanich, Siriphong | Online Contents | 2010


    Mainstream Traffic Flow Control on Freeways Using Variable Speed Limits

    Rodrigo Castelan Carlson / Ioannis Papamichail / Markos Papageorgiou | DOAJ | 2013

    Freier Zugriff