Montana Department of Transportation

ROUNDABOUTS

About Roundabouts

Purpose for Roundabouts

History of Roundabouts

How to Use a Roundabout

Motor Vehicle

Bicycle

Pedestrian

Frequently Asked Questions

Roundabout Locations

What is a Roundabout?

Roundabouts are circular intersections that incorporates a new design that reduces traffic accidents, traffic delays and traffic speeds There are no traffic signals or stop signs in a round about. Most roundabouts have the following design features:

Yield at Entry - Traffic entering the roundabout yields the right-of-way to vehicles already in the roundabout.

One-Way Travel - Vehicles in a roundabout travel in one direction only (counterclockwise).

Central Island - A raised, painted, or landscaped central island.

Slower Speeds - Geometric features physically limit vehicle speeds to 25 mph or less.