EFFECTS OF MULTIPLE-POINT DETECTORS ON DELAY AND ACCIDENTS (DISCUSSION)

The number and location of detectors on intersection approaches that have actuated signal controllers and high traffic approach speeds have been studied by various researchers. The relation of detector activity to yellow signal intervals and the presence of dilemma zones has also been investigated. Several procedures for locating multiple detectors on problematic intersection approaches have been proposed as solutions to dilemma zone and other traffic control problems. Four multiple-detector placement methods are compared through computer simulation in a relative evaluation of their effects on vehicular delay. Traffic performance statistics produced through computer simulation are compared with those obtained through field observation. Conventional single-point detection schemes are also compared with multiple detectors through before-and-after field tests at 10 typical field sites. The four methods for placing multiple detectors were not found to produce statistically significant differences in vehicular delay when compared with each other or with single-point detection. Multiple detectors were found to produce statistically significant reductions in accident experience for approach speeds of 50 mph or greater. (Author)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1982/881/881-001.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=EFFECTS+OF+MULTIPLE-POINT+DETECTORS+ON+DELAY+AND+ACCIDENTS+(DISCUSSION)&author=C.+Wu&author=C.+Lee&author=R.+Machemehl&author=J.+Williams&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 Committee on Traffic Control Devices. 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

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Wu, Ching-Shuenn
  • Lee, Clyde E
  • Machemehl, Randy B
  • Williams, Jim
• Discussers:
  • Parsonsen, Peter S
• Publication Date: 1982

Media Info

• Media Type: Digital/other
• Features: References;
• Pagination: pp 1-9
• 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: Actuated traffic signal controllers; Approach lanes; Before and after studies; Field tests; Intersections; Location; Simulation; Traffic actuated controllers; Traffic crashes; Traffic delays; Vehicle detectors
• Old TRIS Terms: Intersection approach
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 00372257
• Record Type: Publication
• ISBN: 030903468X
• Report/Paper Numbers: HS-034 932
• Files: HSL, TRIS, TRB
• Created Date: May 31 1983 12:00AM