BETTER USE OF SIGNALS UNDER OVERSATURATED FLOWS

A measure of oversaturation is developed and validated with field data. A control policy for oversaturated intersections is developed. The results of this work have applicability wherever intersection oversaturation is frequently experienced. The primary objective of this control policy is to delay or eliminate intersection blockage, which is the outgrowth of oversaturation. The control policy developed in this paper (queue-actuated control) is of a tactical nature. It responds to quenues (maximum queues allowed at both approaches of an intersection) similar to the way in which the current traffic-actuated control responds to demand. The new control policy can be applied to isolated intersections as well as to coordinated ones. The specific aspects addressed are field validation of the new measure of oversaturation, development of a delay model for queue-actuated control, and effects of queue-actuated control on adjacent intersections. Validation of the delay model and evaluation of quene-actuated control in alleviating the problems of oversaturation are performed with the UTCS-1 simulator.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/sr/sr153/153-008.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0360859X
• Supplemental Notes:
  • Presented at the 7th Summer Mtg. of TRB in cooperation with Florida DOT, Jacksonville, Fla., Aug. 5-7, 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:
  • Lee, Bumjung
  • Crowley, Kenneth W
  • Pignataro, Louis J
• Conference:
  • 7th Summer Meeting of the Transportation Research Board
  • Location: Jacksonville Florida, United States
  • Date: 1974-8-5 to 1974-8-7
• Publication Date: 1975

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 60-72
• Monograph Title: Better use of existing transportation facilities
• Serial:
  • Transportation Research Board Special Report
  • Issue Number: 153
  • Publisher: Transportation Research Board
  • ISSN: 0360-859X

Subject/Index Terms

• TRT Terms: Actuated traffic signal controllers; Intersections; Mathematical models; Queuing; Traffic congestion; Traffic control; Traffic delays
• Uncontrolled Terms: Models
• Old TRIS Terms: Actuated control
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00099498
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Nov 5 1975 12:00AM