This guide is currently under review by practicioners and others in the field. Subsequently, the material provided on this page is subject to change in the future. Replaces a signalized intersection that is experiencing heavy traffic backup and congestion. Slows speeds at an intersection. Creates a gateway into an area.
Roundabouts have a mixed record regarding bicyclist safety low design speed required.
Roundabouts are generally not appropriate if traffic volumes are extremely high. Roundabouts often work best where there is a high percentage of left-turning traffic. Deflection on each leg of the intersection must be set to control speeds to 15-18 mph.