Montana Department of Transportation

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Montana Traveler Information

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.

Roundabout diagram