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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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    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. 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.
    2. 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.

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