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On the Flow Capacity of Automated Highways

Author

Listed:
  • J. G. Bender

    (The Ohio State University, Columbus, Ohio)

  • R. E. Fenton

    (The Ohio State University, Columbus, Ohio)

Abstract

Virtually all proposed systems for highway automation have at least one mode in common---steady-state car following. The nature of this mode is extremely important, as it can determine the upper limit of flow capacity of an automated highway. This limit is explored for a linear headway controller, and a fundamental relation between the effective vehicle response time and the permissible traffic stream density is obtained. The required intervehicular spacing with a linear headway controller is shown to be proportional to the effective vehicle time constant for small-signal inputs; thus, one can achieve small spacings and high flow rates by reducing this parameter to 1 sec or less. However, the vehicle is then highly responsive to small changes in lead-vehicle speed---possibly resulting in both passenger discomfort and poor fuel economy. These shortcomings can be avoided by using a linear velocity controller for automatic car following.

Suggested Citation

  • J. G. Bender & R. E. Fenton, 1970. "On the Flow Capacity of Automated Highways," Transportation Science, INFORMS, vol. 4(1), pages 52-63, February.
    • Handle: RePEc:inm:ortrsc:v:4:y:1970:i:1:p:52-63
    DOI: 10.1287/trsc.4.1.52
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    Cited by:

    1. Zhang, Xiaoyan & Jarrett, David F., 1997. "Stability analysis of the classical car-following model," Transportation Research Part B: Methodological, Elsevier, vol. 31(6), pages 441-462, November.
    2. Scag & Path, 1993. "Highway Electrification And Automation Technologies - Regional Impacts Analysis Project: Phase I: Baseline Scenario Data Analysis," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt6s65543t, Institute of Transportation Studies, UC Berkeley.
    3. Pham, Hung & Tomizuka, Masayoshi & Hedrick, J. Karl, 1997. "Integrated Maneuvering Control For Automated Highway Systems Based On A Magnetic Reference/sensing System," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt7hk255bn, Institute of Transportation Studies, UC Berkeley.

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