OPTIMIZATION OF PRETIMED SIGNALIZED DIAMOND INTERCHANGES

This paper describes a computer program that can determine the best strategy for a pretimed signalized diamond interchange to minimize the average delay per vehicle. This program, Passer III, is one of a series of signalization programs developed for the Texas State Department of Highways and Public Transportation. All basic interchange signal phasing sequences, including all possible patterns from lead-lead, lag-lead, lead-lag, and lag-lag phasings, are evaluated by the program. Interchange performance is evaluated by using average vehicle delay; exterior delay is calculated by Webster's delay equation; and interior delay is determined from deterministic delay-offset techniques. Minimum delay analyses of 18 sample proble problems were made. Many signalization phasing patterns were found to provide optimum operation over the set of problems evaluated. While four-phase overlap and three-phase timing plans were normally found to provide good operation, other signalization patterns may produce even better operation. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 78-84
  • Monograph Title: Highway capacity, traffic flow, and traffic control devices
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183548
  • Record Type: Publication
  • ISBN: 0309026733
  • Files: TRIS, TRB
  • Created Date: Dec 3 1978 12:00AM