MEASURING DELAY BY SAMPLING QUEUE BACKUP

The relation of sampling of queue backup and delay at signalized intersections was studied and evaluated for use as a level-of-service indicator for intersection performance. Time-lapse photography was used at four urban intersections controlled by pretimed signals to determine time-in-queue delay. At the same time, each field observer sampled the position of the rear of the queue in one lane at 10-s intervals. Other field methods of measuring delay were tested also. Regression analysis of resulting delay values by cycle yielded high correlations between queue backup delay from field sampling and time-in-queue delay from film analysis. Field sampling of queue backup was found to be much simpler to use in the field than field sampling of stopped time delay. Field sampling was confined primarily to three unsaturated approaches that had few left-turning vehicles. Further study is needed to validate and refine field procedures under a wider range of conditions. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 30-36
  • Monograph Title: Capacity and measurement of effectiveness
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00162981
  • Record Type: Publication
  • ISBN: 0309025915
  • Files: TRIS, TRB
  • Created Date: Oct 13 1977 12:00AM