An aerial view of a roundabout .  Several cars and trucks are driving on the roundabout.

Intersection safety and efficiency is a key priority for the Wisconsin Department of Transportation (WisDOT) and every intersection is unique. Unlike other states that have adopted “rounda​bout ​first” policies, WisDOT evaluates design alternatives to determine whether a signal, roundabout or other control is best suited for the location based on safety, efficiency an​d estimated cost.​

Wisconsin roundabouts

Roundabouts are found at one percent of the intersections on the state highway system. As of May 2022, eight percent of state-controlled intersections have traffic signals. Of the state's 45​7 roundabouts, 266 are on state highways and 191 are on local highways.

Graph of Wisconsin's intersections.  1% are roundabouts.

Benefit​s o​​​f roundabouts

Roundabouts may be considered as an alternative when building new intersections or when doing a complete reconstruction to correct safety or reduce congestion because roundabouts:

  • Are proven to reduce the number of severe injury crashes and deaths
  • Provide a good economic value
  • Reduce delay and improve traffic flow
  • Are a greener alternative with less vehicle idling, lower fuel emissions and less wasted fuel

Roundabout locations

​See the roundabouts interactive map.


Van Walling, PE​
WisDOT Roadway Design Standards Engineer
(608) 266-1585