ANALYSIS OF MINIMUM SAFE HEADWAY FOR NO COLLISIONS

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:
  http://onlinepubs.trb.org/Onlinepubs/sr/sr170/170-055.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0360859X
• 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:
  • Conference on Dual-Mode Transportation
  • Location: Washington District of Columbia, United States
  • Date: 1974-5-29 to 1974-5-31
• Publication Date: 1976

Media Info

• Media Type: Print
• Pagination: p 148
• Monograph Title: Dual-mode transportation
• Serial:
  • Transportation Research Board Special Report
  • Issue Number: 170
  • Publisher: Transportation Research Board
  • ISSN: 0360-859X

Subject/Index Terms

• TRT Terms: Control systems; Deceleration; Headways; Safety; Velocity
• Uncontrolled Terms: Criteria
• Subject Areas: Highways; Planning and Forecasting; Safety and Human Factors;

Filing Info

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