The paper presents a set of expressions describing the effects of various system characteristics on minimum safe headway. None of the individual relations used in the paper are new to the transit literature; however, two of the concepts should be more heavily emphasized now that automatic transit systems carry an increasing number of passengers. 1) Minimum safe headway should be expressed in terms of the physical interrelations of all pertinent system characteristics, including wind and grade. Similarly, headway criteria should be chosen on the basis of control system capabilities and sufficient failure experience. 2) Differential velocity and differential emergency deceleration must be accounted for in minimum-safe-headway computations. The work presented is not intended to be universally applicable and will doubtless be modified with the application of new safety assurance and control techniques. However, it does represent a rationale for expressing minimum safe headway in terms of specific hardware parameters and environmental conditions. /Author/

  • Record URL:
  • Availability:
  • Supplemental Notes:
    • This paper appears in Dual Mode Transportation, which is a publication containing the proceedings of a conference conducted by the Transportation Research Board, May 29-31, 1974. 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
  • Corporate Authors:

    Transportation Research Board (TRB)

    Washington, DC   
  • Authors:
    • Lobsinger, David J
  • Conference:
  • Publication Date: 1976

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00149280
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Mar 30 1977 12:00AM