Analysis of mechanisms by which ramp metering can reduce traffic delay, such as increasing bottleneck flow, expediting flow to exits upstream of the bottleneck, and diverting traffic around the bottleneck, suggests that minimization of delay and minimization of congestion on the freeway main line are not always compatible objectives. Simulations were performed to tentatively resolve this question. These simulations used a flow model based on Newell’s simplified kinematic wave theory and a control strategy that was a modification of that of Wattleworth and Berry. Simulation scenarios defined physical characteristics, demand patterns, and flow characteristics for hypothetical freeway sections on the basis of data from Blumentritt et al. and the San Diego area. Results of the simulations show that there are circumstances under which minimization of delay does not coincide with minimization of congestion on the main line and that relationships between delay and main-line congestion depend on the combination of the metering mechanisms in effect.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Are Minimization of Delay and Minimization of Freeway Congestion Compatible Ramp Metering Objectives?


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2000-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Freeway ramp metering: an overview

    Papageorgiou, M. / Kotsialos, A. | IEEE | 2000


    Freeway Optimization Utilizing Ramp Metering

    Bieberitz, J. A. / Institute of Transportation Engineers | British Library Conference Proceedings | 1994


    Freeway On-Ramp Metering, Delay Savings, and Diverge Bottleneck

    Cassidy, Michael J. | Transportation Research Record | 2003


    Freeway On-Ramp Metering, Delay Savings, and Diverge Bottleneck

    Cassidy, Michael J. | Online Contents | 2003