A REVIEW OF THE RAMSEY-ROUTLEDGE METHOD FOR GAP ACCEPTANCE TIMES

The Ramsey-Routledge method is easy to use but is reported to have a number of shortcomings. A simulation by the author to test the method showed a bias in the results equal to approximately half the cell size. The author, after briefly describing the method, derives the equations for the density of critical gaps for both the discrete and continuous cases and shows how under some circumstances the derived density can be negative. In particular, at small cell sizes, which are necessary to reduce the bias, the density of critical gaps can be negative. The method is compared with other standard methods of determining gap acceptance times and it is suggested that the other methods, although less simple to use, are statistically preferable. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
• Corporate Authors:

  Printerhall Limited

  29 Newmart Street
  London W1P 3PE,   England 
• Authors:
  • Troutbeck, R J
• Publication Date: 1975-9

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 373-375
• Serial:
  • Traffic Engineering & Control
  • Volume: 16
  • Issue Number: 9
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Decision making; Density; Evaluation; Evaluation and assessment; Gap acceptance; Mathematical models; Methodology; Spacing; Statistical analysis; Statistical bias; Time; Traffic flow; Vehicle spacing
• Old TRIS Terms: Determination
• ITRD Terms: 2248: Decision process; 9020: Evaluation (assessment); 6473: Mathematical model; 9102: Method; 5414: Time; 694: Vehicle spacing
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Planning and Forecasting; I71: Traffic Theory; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00131473
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: May 14 1976 12:00AM