Citation

Isebrands H. ITE J. 2009; 79(2): 30-32, 37-38.

Copyright

(Copyright © 2009, Institute of Transportation Engineers)

DOI

unavailable

PMID

unavailable

Abstract

Although roundabouts usually are not placed adjacent to signalized intersections, at times a roundabout may be the best alternative for the location. With proper planning and evaluation, roundabouts, signals and stop signs can co-exist along the same corridor. This article describes the performance of a corridor in Eagle, Colorado, with a roundabout, two traffic signals and two stop-controlled intersections. The roundabout provided the town with a feasible intersection alternative at a location with multiple physical constraints and two dominant turning movements. The corridor experienced improved operations during the first five years after the roundabout was constructed. Although increasing traffic demand has led to traffic congestion along the corridor, little of the congestion can be attributed to the roundabout. A corridor analysis that considers traffic volumes and turning movements, intersection spacing, existing traffic control, queuing, available right of way and corridor footprint should always be undertaken to determine if roundabouts and signals on the same corridor are a useful approach to traffic control.