Montana Department of Transportation

ROUNDABOUTS

About Roundabouts

Purpose for Roundabouts

History of Roundabouts

How to Use a Roundabout

When Going Straight Ahead:

Use either approach lane, unless otherwise posted.
Maintain your position relative to other vehicles. Stay to the inside of the circulatory roadway if you entered from the left approach lane, or stay to the outside if you entered from the right approach lane.
As you exit the roundabout, look out for vehicles traveling on the outside of the circulatory roadway that may continue to circulate around the roundabout.