THE EFFECTS OF GAP ACCEPTANCE CRITERIA ON MERGING DELAY AND CAPACITY AT AN UNCONTROLLED JUNCTION

Many studies of gap acceptance in the merging delay problem at an uncontrolled junction use the assumption that each minor road driver waiting to merge is consistent in the sizes of gaps in the main traffic stream he accepts or rejects, i.e. That each driver has a fixed critical gap. Recent observations show that drivers are not consistent in their gap acceptance behaviour. In this paper, the authors compare the assumption of a fixed critical gap per driver with a more realistic formulation of driver gap acceptance, and show that, for the method that would be used in practice to obtain from observations the population distribution of critical gaps, the assumption leads to a correct estimation of average delay to a merging driver, a slight overestimation of the probability of no delay and a serious overestimation of the variance of delay. The assumption results also in a slight overestimation of the capacity of the minor road at the junction. /Author/TRRL/

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  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Blumenfeld, D E
    • Weiss, G H
  • Publication Date: 1979-1

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Filing Info

  • Accession Number: 00194447
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 11 1979 12:00AM