Roundabouts

Roundabouts are becoming a preferred intersection design for many reasons Lauby and Greensburgincluding increased safety, reduced wait times, and less maintenance costs. 

Roundabouts are safer intersections.

  • Reduce accidents by 39%
  • Reduce serious accidents by 75%
  • Have only 8 conflict points where an accident may occur, whereas a traditional intersection has 32
  • Reduce travel speed at the roundabout to between 15 and 22 mph, yet still allowing traffic to move

Roundabouts reduce traffic wait times and provide traffic flow.Steese Road Roundabout

  • Reduced idle time saving time and money (less gas)
  • Efficient way to move heavy traffic
  • No stop signs or traffic signals to slow down traffic

Roundabouts cost less to maintain.

  • No need to maintain traffic signal
  • Still functions despite power outages


What's a roundabout?Roundabout Sign

A roundabout is a circular road junction where traffic enters a stream around a central island after first yielding to traffic already circulating.

How do I navigate a roundabout?

General Rules:*

  • Slow down and yield to pedestrians.
  • Follow traffic signs.
  • Do not stop in a roundabout except to avoid a collision.
  • Roundabout traffic has the right-of-way over entering traffic.
  • Move into the correct lane in which you want to travel.
  • Keep to the right of the island.
  • Enter the roundabout when there is an adequate gap in the traffic flow.
  • Keep your speed low (approximately 15 to 22 mph) in the roundabout.
  • Do not overtake other vehicles or bicyclists when in the roundabout.

Turning Right at a Roundabout

To make a right hand turn:

1. Approach the roundabout in the right-hand lane

2. Enter the roundabout when there is an adequate gap in traffic.

3. Use your right hand turn signal and make your continuous right hand turn.

Illustration of navigating a roundaboutContinuing Straight at a Roundabout

1. Enter the intersection in either the right or left lane (if a two lane roundabout) when there is an adequate gap in traffic.

2. Do not change lanes in the roundabout. Continue in your lane.

Turning Left or Making a "U" at a Roundabout

1. Approach the roundabout in the left-hand lane.

2. Enter traffic when there is an adequate gap in traffic. Stay in the inside lane. When you pass the last exit point before your turn, use your right turn signal and continue to use your right-turn signal through your exit. Maintain a slow speed.

3. When exiting from the inside lane, watch out for leading or adjacent vehicles on the outside that continue to circulate around the roundabout.

Illustration provided by Franklin County, Ohio Engineering Department.

Need more information on roundabouts? Check out these links.

U.S. Department of Transportation Federal Highway Administration

Insurance Institute on Highway Safety

 *General rules provided by the Wisconsin Department of Transportation and URS Designers