Comparative Analysis of Intersection Control

Operational analyses have been performed at 10 existing signalized intersections to compare signal-controlled intersections and conceptual roundabouts. All traffic operations analyses were completed using the aaSIDRA (Australian) model. Traffic data was collected at three stop-controlled intersections and ten signalized intersections that were recently converted from stop-control to signal-control or recently modified, and where roundabouts are expected to be feasible. Average vehicle delay has been identified as the most effective operational parameter for comparing traffic flow with respect to intersection control. Additional comparisons were made for the following parameters: fuel consumption, selected to account for environmental impacts; proportion of vehicles queued, selected to account for driver-perceived operations; and crash history, incorporated with a summary of the most recent research estimates of safety impacts related to intersection control. Had roundabouts been constructed at the intersections that were recently signalized or modified, a reduction in peak hour vehicle delay of 62 to 74 percent could be expected. This is equivalent to approximately 320,000 fewer vehicle-hours of delay on an annual basis. Annual fuel consumption would be reduced by nearly 235,000 gallons, with commensurate reductions expected in vehicle emissions. These results provide strong evidence that roundabouts can improve traffic flow and safety when compared to signal controlled intersections and therefore should be considered as an alternative at locations where capacity requires improvement of stop-controlled intersections.


  • English

Media Info

  • Media Type: Print
  • Features: CD-ROM; References; Tables;
  • Pagination: 20p
  • Monograph Title: ITE 2005 Annual Meeting and Exhibit Compendium of Technical Papers

Subject/Index Terms

Filing Info

  • Accession Number: 01006872
  • Record Type: Publication
  • ISBN: 1933452080
  • Files: TRIS, ATRI
  • Created Date: Oct 22 2005 12:49PM