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Critique of a Freeway On-Ramp Metering Scheme and Broader Related Issues

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  • Cassidy, Michael J.

Abstract

Offered here is a critique of a simple scheme recently proposed for metering freeway on-ramps. An earlier report of this scheme's potential for reducing commuter delay is shown to be exaggerated. The discussion makes clear that to reduce delay, metering should increase the rates at which commuters exit the freeway. The scheme critiqued here, as well as other well-known metering algorithms, are shown to have deficiencies in this, particularly when the freeway is plagued by a diverge bottleneck with a congested off-ramp. Other more effective schemes for reducing the delay caused by these types of bottlenecks are described. Suitable ways of field-testing freeway traffic management strategies are discussed as well.

Suggested Citation

  • Cassidy, Michael J., 2002. "Critique of a Freeway On-Ramp Metering Scheme and Broader Related Issues," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt804724nd, Institute of Transportation Studies, UC Berkeley.
    • Handle: RePEc:cdl:itsrrp:qt804724nd
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    References listed on IDEAS

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    1. Cassidy, Michael J. & Bertini, Robert L., 1999. "Some traffic features at freeway bottlenecks," Transportation Research Part B: Methodological, Elsevier, vol. 33(1), pages 25-42, February.
    2. Cassidy, Michael J. & Anani, Shadi B. & Haigwood, John M., 2000. "Study of Freeway Traffic Near an Off-Ramp," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt4mh8b630, Institute of Transportation Studies, UC Berkeley.
    3. Bertini, Robert L. & Cassidy, Michael J., 2002. "Some observed queue discharge features at a freeway bottleneck downstream of a merge," Transportation Research Part A: Policy and Practice, Elsevier, vol. 36(8), pages 683-697, October.
    4. Cassidy, M. J. & Mauch, Michael, 2001. "An observed traffic pattern in long freeway queues," Transportation Research Part A: Policy and Practice, Elsevier, vol. 35(2), pages 143-156, February.
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    Cited by:

    1. Gomes, Gabriel C., 2004. "Optimization and Microsimulation of On-ramp Metering for Congested Freeways," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt95k1q411, Institute of Transportation Studies, UC Berkeley.
    2. Cassidy, Michael J. & Rudjanakanoknad, Jittichai, 2002. "Empirical Study of Ramp Metering and Capacity," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt41f4d25j, Institute of Transportation Studies, UC Berkeley.

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