Colorado The roundabout is a popular concept in Europe, which is slowly gaining favor in the United States.
Roundabouts are typically circular, with an intersecting street in each quadrant.
This concept has been reengineered for the Town of Avon, Colorado, which was experiencing traffic congestion. Whereas roundabouts are typically circular, the Avon roundabouts are circular, oval, and even raindrop shaped. This variation resulted from traffic engineering studies which defined traffic patterns and then optimized circulation requirements to enhance traffic movement capacity. One roundabout is located on each side of the interchange allowing entering and exiting traffic to circulate through the interchange without necessarily stopping. Conventional interchanges feature stop signs or traffic signals at the ramp termini for control, however this adaptive design only requires a driver to yield to oncoming traffic that is circulating in the roundabout.