Public Works

Roundabouts 

Local Projects

Driving a Roundabout   
Rendering depicting cars traveling counterclockwise through a roundabout

  1. Approach: Slow down. Yield to pedestrians.
  2. Enter: Yield to vehicles in the roundabout. Wait for a gap in traffic, and merge into traffic in a counterclockwise direction.
  3. Proceed: Continue through the roundabout until you reach your street. Never stop in the roundabout.
  4. Exit: Exit the roundabout to your right. Yield to pedestrians in the crosswalk.

Download a simple rendering on How To Drive a Roundabout. 
  


What is a Roundabout?

A modern roundabout is an unsignalized, circular intersection engineered to maximize safety and minimize traffic delay. Fundamental characteristics of all roundabouts include:

  • Counterclockwise Flow. Traffic travels counterclockwise around a center island
  • Entry Yield Control. Vehicles entering the roundabout yield to traffic already circulating.
  • Low Speed. Curvature that results in lower vehicle speeds, generally 15-25 MPH, throughout the roundabout

(video courtesy of Insurance Institute for Highway Safety)

Benefits of Roundabouts

SAFETY

  • More than 90% reduction in fatalities
  • 76% reduction in injuries
  • 35% reduction in all crashes
  • Eliminates head-on crashes and right-angle crashes
  • Decreases severity of crashes
  • Reduces speeds 

TRAFFIC FLOW

  • Can move more traffic during peak hours
  • Reduces stops
  • Reduces delays
  • Reduces congestion 

Sources: Iowa Department of Transportation, Federal Highway Administration, Center for Transportation Research and Education

Resources on Roundabouts



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