Headway distributions in highway traffic flow

  • R. J. Salter


The concept of level of service in highway traffic flow illustrates the differences in the characteristics of the flow which may be examined by a study of the headways between vehicles. Time headways are the time intervals between the passage of successive vehicles past a point on the highway. Because the inverse of the mean time headway is the rate of flow, headways have been described as the fundamental building blocks of traffic flow. When the traffic flow reaches its maximum value then the time headway reaches its minimum value.


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  1. 1.
    F. A. Haight, B. F. Whisler and W. W. Mosher. New statistical method for describing highway distribution of cars. Proc. Highw. Res. Bd, 40 (1961) 557–64Google Scholar
  2. 2.
    J. P. Kinzer. Applications of the theory of probability to problems of highway traffic. Proc. Inst. Traffic Engrs (1934), 118–23Google Scholar
  3. 3.
    W. F. Adams. Road traffic considered as a random series. J. Instn civ. Engrs (1936), 121–30Google Scholar
  4. 4.
    A. J. Miller. A queueing model of road traffic flow. J. R. statist. Soc., 23B (1961), 1.Google Scholar
  5. 5.
    A. Schuhl. The probability theory applied to distribution of vehicles on two-lane highways. Poisson and Traffic, the Eno Foundation (1955), p. 59–75Google Scholar
  6. 6.
    J. H. Kell. Analysing vehicular delay at intersections through simulation. Highw. Res. Bd Bull. 1 (1962), 28–9Google Scholar
  7. 7.
    W. L. Grecco and E. C. Sword. Predictions of parameters for Schuhl’s headway distribution. Traff. Engng (Feb. 1968), 36–8Google Scholar
  8. 8.
    R. J. Salter. A simulation of traffic flow at priority intersections. J. Instn munic. Engrs, 98 (Oct. 1971), 10, 239–48Google Scholar

Copyright information

© R. J. Salter 1976

Authors and Affiliations

  • R. J. Salter
    • 1
  1. 1.University of BradfordUK

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