How roundabouts work

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Driving vehicles in a roundabout

  • Slow down.
  • Watch for and obey traffic signs.
  • Move into the correct lane the direction you want to travel as you approach the roundabout.
  • Yield to pedestrians and bicyclists as you enter and exit the roundabout.
  • Yield to all lanes of traffic on your left before entering.
  • Keep your speed low and stay in your lane within the roundabout (do not change lanes within the roundabout).
  • Exit carefully to your destination. Use your right-turn signal, in front of the splitter island just prior to your exit, to indicate your intention to exit.

Watch for large vehicles

  • 2015 Wisconsin Act 139 requires drivers at roundabouts to yield right-of-way to trucks and other large vehicles (and combinations of vehicles, such as trucks towing boats or RVs towing cars) measuring at least 40 feet long or 10 feet wide.
  • Motorists are required to give space to larger vehicles when approaching and driving through roundabouts.
  • The law was passed in the interest of safety, as commercial trucks can weigh up to 80,000 pounds, and most larger vehicles have an expanded turning radius.
  • Drivers are asked to remain mindful that all motorists approaching a roundabout must yield to any traffic already within a roundabout, as signed and per law.
  • If two large vehicles approach a roundabout at the same time, the vehicle on the right must yield right-of-way to the vehicle on the left.

Driving bicycles in a roundabout

  • If you are riding on the shoulder or bike lane, merge into the traffic lane before the shoulder ends.
  • Signal your intent to move into traffic.
  • Once inside the roundabout, don't hug the curb.
  • Ride close to the middle of the lane to prevent cars from passing and cutting you off.
  • Watch for cars waiting to enter the roundabout, as they may not see you.
  • If you do not want to ride your bike in the roundabout, use the sidewalk and proceed as a pedestrian.

Brochures - Using roundabouts and safety information





  • "WisDOT roundabout television commercial: Take it Slow" (00:30)