This article illustrates the effects of signal queues on traffic operations at closely spaced intersections. The authors propose an approach that relates the size of a downstream queue to physical link length and saturation flow rate at the upstream signal. Queue interaction effects occur when traffic volumes approach capacity. Queue interaction results in lower system output, added delay to the upstream link, and high probability of spill back. The proposed method also demonstrates the utility of signal-based methods in overcoming some detrimental aspects of queue interaction. Specifically, the use of simultaneous offset settings and metering policies at the upstream signal were found to be effective. Turning traffic from side roads at the upstream signal has been shown to cause further degradation of the traffic operations at closely spaced signals. Investigators suggest extension of the method to multiple intersections and complex phasing schemes.

  • Availability:
  • Corporate Authors:

    Institute of Transportation Engineers (ITE)

    Washington, DC  United States 
  • Authors:
    • Rouphail, N M
    • Akcelik, R
  • Publication Date: 1996-7


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726956
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Oct 17 1996 12:00AM