Calculations of signal timing and capacity have been performed in Sweden by using methods based on the 1950 and 1965 Highway Capacity Manuals. These methods, however, give results that differ by as much as 50 percent from observed flows. A comprehensive development was therefore undertaken by the Swedish National Road Administration from 1971 to 1976. After extensive literature reviews, theoretical analyses, and field studies, a method was developed for calculating signal timing, capacity, queue length, proportion of stoped vehicles, and delay. The method is based on calculating saturation flows separately for each lane, which makes the method applicable to all geometric designs and phasing schemes. Adjustment factors for vehicle-acutuated control are also included. Study emphasis was on the relations among approach width, lane markings, and capacity; conflicts between left-turning and opposing flows; and conflicts between turning vehicles and pedestrians. The signal-timing method is based on the minimum average delay criterion proposed by Webster. /Author/

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    • This paper appeared in TRB Research Record No. 667, Highway Capacity, Measures of Effectiveness, and Flow Theory. 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 Publication of this paper sponsored by Committee on Highway Capacity and Quality of Service.
  • Authors:
    • Bång, Karl-Lennart
  • Discussers:
    • Blumenthal, Robert C
    • Hutter, Jack A
    • Carter, Arthur A
  • Publication Date: 1978

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: p 11-28
  • Monograph Title: Highway capacity, measures of effectiveness, and flow theory
  • Serial:

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Filing Info

  • Accession Number: 00189846
  • Record Type: Publication
  • Report/Paper Numbers: HS-025 846
  • Files: TRIS, TRB
  • Created Date: Apr 12 1979 12:00AM