Improving the Capacity of Signalized Intersections Based on the Assessment of Signal Change Intervals

Signal change intervals ensure a safe clearing of the intersection before entering vehicles arrive at conflict areas. They also reduce the capacity of signalized intersections significantly. Procedures to calculate signal change intervals are based on a number of simplifications and assumptions. A detailed theoretical and empirical assessment of the processes during the signal change intervals not only discloses the exact impacts of all parameters describing these processes on the capacity, but reveals inconsistencies of the prevailing calculation procedures for signal change intervals. The aim of the research presented here was to develop a general model describing the influence of signal change intervals (or intergreen times) on the capacity of signalized intersections, quantify the impacts, and highlight the improvement potential. While the exact improvement potential depends on the local situation (namely the number of approach lanes, saturation headways, and the cycle time), it is apparent that green times could be extended by several seconds per stage change by optimized intergreen times, stage settings, and stage sequences. This underlines the potential of integrating the proposed model into the assessment procedures of signalized intersections.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References;
  • Pagination: 17p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152495
  • Record Type: Publication
  • Report/Paper Numbers: 10-1516
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 10:40AM