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.