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. Average vehicle delay has been identified as the most effective operational parameter for comparing traffic flow with respect 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 per cent 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. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E213531.
Abstract