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Study of Freeway Traffic Near an Off-Ramp

Author

Listed:
  • Cassidy, Michael J.
  • Anani, Shadi B.
  • Haigwood, John M.

Abstract

A bottleneck with a diminished capacity is shown to have arisen on a freeway segment whenever queues from the segment's off-ramped spilled over and occupied its mandatory exit lane. It is also shown that longer exit queues from the over-saturate off-ramp were accompanied by lower discharge rates for non-exiting vehicles. The explanation appears to be rubber-necking on the part of the non-exiting drivers. Whenever the of-ramp queues were prevented from spilling over to the exit lane (by changing the logic of a nearby traffic signal), much higher flows were sustained on the freeway segment and a bottleneck did not arise there. These observations underscore the value of control strategies that enable diverging vehicles to exit a freeway unimpeded. Key words: Freeway Traffic Control, Off-Ramps, Bottlenecks

Suggested Citation

  • 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.
    • Handle: RePEc:cdl:itsrrp:qt4mh8b630
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    File URL: https://www.escholarship.org/uc/item/4mh8b630.pdf;origin=repeccitec
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    References listed on IDEAS

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    1. Cassidy, Michael J., 1998. "Bivariate relations in nearly stationary highway traffic," Transportation Research Part B: Methodological, Elsevier, vol. 32(1), pages 49-59, January.
    2. Lin, Wei-Hua & Daganzo, Carlos F., 1997. "A simple detection scheme for delay-inducing freeway incidents," Transportation Research Part A: Policy and Practice, Elsevier, vol. 31(2), pages 141-155, March.
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    Cited by:

    1. Tam, Robert, 2000. "PATH ATMIS State of the Research Annual Report Fiscal Year 1999 / 2000," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt2zd1f7v9, Institute of Transportation Studies, UC Berkeley.
    2. 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.

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