This paper describes the facts that have been observed on Japanese motorways, and presesnts an hypothesis on the reason for, and the mechanism of, the low capacities at sags and tunnels. Macroscopic and microscopic traffic aspects are described, as well as a hypothetical mathematical model of car following in congested flow. The generation and amplification of shock waves are described, as well as the transition from free flow to congested flow. The impact of light changes (sunrise, sunset), and the effect of weather are discusesd. Conclusions drawn from the study are discussed. These conclusions relate to the capacities of tunnels and sags, drivers' transition of car-following behavior, and the departure flow rate from a queue.

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  • Corporate Authors:

    Institute of Transportation Engineers (ITE)

    Washington, DC  United States 
  • Authors:
    • KOSHI, M
    • Kuwarara, M
    • Akahane, H
  • Publication Date: 1992-5

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Filing Info

  • Accession Number: 00621827
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 30 1992 12:00AM