MACROSCOPIC TRAFFIC DELAY MODEL OF BUS SIGNAL PREEMPTION

Productivity enhancement of public transportation is an essential goal, and bus signal preemption at intersections is one of the transportation system management strategies that strives for this goal. Improvements in bus speed and reductions in delay are the anticipated benefits accrued from such strategy. A macroscopic traffic delay model, which applies stochastic procedure, is presented to evaluate different bus preemption signal strategies at an isolated intersection. The model permits the user to evaluate a certain operational strategy provided for bus traffic on both main and cross streets. The signal controller modeled in this paper has a green extension and red truncation capabilities. A comparison between preemption on both main and cross street and preemption on main street only is provided to validate the model's logic. Sensitivity analyses were implemented and it was found that the delay savings due to signal preemption are sensitive to saturation flow rate and to bus passenger load. Potential applications and further enhancement are suggested. (Author)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1982/881/881-010.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=MACROSCOPIC+TRAFFIC+DELAY+MODEL+OF+BUS+SIGNAL+PREEMPTION&author=A.+Radwan&author=J.+Hurley&publication_year=1982
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/030903468X
• Supplemental Notes:
  • Publication of this paper sponsored by Task Force on Traffic Signal Systems. 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

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  Washington, DC  United States  20001
• Authors:
  • Radwan, A Essam
  • Hurley Jr, Jamie W
• Publication Date: 1982

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp. 59-65
• Monograph Title: TRAFFIC CONTROL DEVICES AND TRAFFIC SIGNAL SYSTEMS
• Serial:
  • Transportation Research Record
  • Issue Number: 881
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Bus priority; Percent saturation; Productivity; Public transit; Savings; Sensitivity; Stochastic processes; Traffic delays; Traffic signal control systems; Traffic signal preemption; Traffic simulation; Transportation system management
• Uncontrolled Terms: Macroscale
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Public Transportation; I73: Traffic Control;

Filing Info

• Accession Number: 00372266
• Record Type: Publication
• ISBN: 030903468X
• Report/Paper Numbers: HS-034 941
• Files: HSL, TRIS, TRB
• Created Date: May 31 1983 12:00AM