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Entrance Capacity of an Automated Highway System

Author

Listed:
  • Randolph W. Hall

    (Department of Industrial and Systems Engineering, 240 GER, University of Southern California, Los Angeles, California 90089-0193)

  • Ali Nowroozi

    (Department of Industrial and Systems Engineering, 240 GER, University of Southern California, Los Angeles, California 90089-0193)

  • Jacob Tsao

    (Computer, Information, & Systems Engineering, ENG 485F-0180, California State University, San Jose San Jose, CA 95192)

Abstract

This paper evaluates the entrance capacity and queueing delay for Automated Highway Systems through use of simulations and analytical modeling. Queueing statistics are also used to determine the sustainable capacity of alternative concepts, taking trip length distribution and spacing between ramps into consideration. Based on safety-spacing headways (produced in a separate analysis), the most promising concept utilizes platoons both on the highway and on on-ramps. However, it is unclear whether comparable capacity can be achieved on exit, when vehicles must be decoupled from their platoons, and whether it is safe for vehicles to enter the highway in closely spaced platoons. The analytical evaluation indicates that entrance/exit spacing on the order of one per 2 km or closer would be required to support highways with total capacity on the order of 20,000 vehicles per hour. Most likely, this would be achieved most efficiently if separate dedicated entrances are provided for automated vehicles, to minimize weaving on manual lanes.

Suggested Citation

  • Randolph W. Hall & Ali Nowroozi & Jacob Tsao, 2001. "Entrance Capacity of an Automated Highway System," Transportation Science, INFORMS, vol. 35(1), pages 19-36, February.
    • Handle: RePEc:inm:ortrsc:v:35:y:2001:i:1:p:19-36
    DOI: 10.1287/trsc.35.1.19.10144
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    Cited by:

    1. Tsao, H. S. Jacob & Zhang, Lan & Lin, Lin & Batni, Deepa, 2004. "Evaluation of Bus and Truck Automation Operations Concepts," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt2f41h8fv, Institute of Transportation Studies, UC Berkeley.
    2. Hall, Randolph & Chin, Chinan & Gadgil, Nishad, 2003. "The Automated Highway System / Street Interface: Final Report," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt0zm6v6m3, Institute of Transportation Studies, UC Berkeley.
    3. Taso, H. S. Jacob & Botha, Jan L., 2003. "Definition and Evaluation of Bus and Truck Automation Operations Concepts: Final Report," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt9pz7n1gr, Institute of Transportation Studies, UC Berkeley.
    4. Hall, Randolph & Chin, Chinan, 2002. "Vehicle Sorting for Platoon Formation: Impacts on Highway Entry and Throughput," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt58t3f9p8, Institute of Transportation Studies, UC Berkeley.
    5. Tsao, H.-S. Jacob & Botha, Jan L., 2002. "Definition and Evaluation of Bus and Truck Automation Operations Concepts," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt4qm8w54d, Institute of Transportation Studies, UC Berkeley.

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