SOME EFFECTS OF UNWARRANTED TRAFFIC SIGNALS

The objective of this study was to provide traffic engineers with factual evidence of the detrimental impacts which occur when traffic signals are installed before they are required. A total of ten intersections from the Greater Lafayette area were studied. They included three signalized intersections and seven STOP sign controlled intersections. The performance of each study intersection was examined and evaluated with respect to travel delay through the intersection and accident frequency. A simulation package, NETSIM, was also employed at some of the intersections to investigate the performance of traffic flow under different types of intersection controls. It was found that unwarranted traffic signals invariably increase the total intersection delay. At three unwarranted signalized locations, cumulative travel delay ranging from 3200 to 4200 vehicle-hours were wasted in 1978 by the major-street traffic. Whereas at another study intersection, the conversion from traffic signal control to two-way STOP control saved 10,340 vehicle-hours in 1978 without any accident increase. Of the 10,340 vehicle-hours saved, approximately 30 percent of them were by the minor-street traffic. (Author)

  • Availability:
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Liu, C-C
  • Publication Date: 1979-9-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 155 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00316484
  • Record Type: Publication
  • ISBN: 8-4-40
  • Report/Paper Numbers: Final Rpt.
  • Files: TRIS, ATRI
  • Created Date: Jan 19 1981 12:00AM