What is a Roundabout?

A roundabout is an intersection which accommodates traffic flow in one direction around a central circular island.  It is used as a form of intersection control, like traffic signals or stop signs.

Why does MoDOT use roundabouts at certain intersections?

The roundabout simplifies an intersection, giving the driver a smoother transition to entrances and exits.

The one-lane roundabout requires drivers to yield to one-way traffic before entering, then round the loop to the appropriate exit.

If you miss the exit, do not stop!  Simply travel around the circle again and exit on the appropriate road.

Tips for Using the Roundabout safely

• Before you enter the roundabout – choose your lane based on where you’re going.
• Slow down before you enter the roundabout.
• Yield to all traffic already in the roundabout.
• Only enter in front of a vehicle already in the roundabout if you have enough space to do so safely.
• Vehicle speeds should be 20 mph or less.
• After entering the roundabout, remain in your lane, change lanes only when traffic is clear.
• Vehicles in the roundabout do NOT yield to entering traffic.
• Never pass or drive next to a truck in a roundabout.
• Do not block emergency vehicles.
• U-turns are only allowed from the left lane.
• Only experienced bicyclists should drive through the roundabout.

Driving the Roundabout