This report discusses the scope, magnitude, and root causes of the congestion/saturation problem as determined by a questionnaire survey of traffic engineering professionals and by an extensive set of personal and telephone interviews. In general, the root causes of congestion--as perceived by these practitioners--are founded in lack of alternate routes, in land use policies that generate the traffic patterns, and in vehicle-pedestrian conflicts that aggravate the situation. Measures of saturation were identified from a complete review of the relevant literature, a thorough analysis of candidate measures, and a program of field work via time-lapse photography. The results of this work were then used to define a set of appropriate measures and to develop definitions of the various levels of saturation. A range of treatments was studied via simulation--the UTCS-1 model simulator was used extensively--analytical methods, and some supportive fieldwork. The various candidate treatments and remedies are discussed in terms of three major categories: 1. Signal: Minimal-response signal policies. 2. Signal: Highly responsive signal policies. 3. Nonsignal: Other treatments in a signalized environment. This report also contains a set of guidelines developed for the treatment of traffic congestion on street networks. The guidelines provide both a tutorial and an illustrated reference in what techniques to consider and how to consider them systematically. /Author/

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    • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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  • Authors:
    • Mcshane, W R
    • Crowley, K W
    • Lee, B
    • Casey, T W
  • Publication Date: 1978

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 152 p.
  • Serial:
    • NCHRP Report
    • Issue Number: 194
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 00189501
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Apr 12 1979 12:00AM