Ride like a car.
If you are comfortable riding in traffic, ride on the circular roadway of the roundabout like a car. Obey all of the same driving instructions as for cars. Watch out for vehicles crossing your path to leave or join the roundabout. Watch out for large vehicles on the roundabout, as they need more space to maneuver.
Single-lane roundabouts shouldn't present much difficulty to bicyclists. On the approach to the entry, signal your intentions and merge into traffic. It is generally safest for bicyclists to ride in the center of the lane and assume their place in traffic just like a car. Keep in mind that drivers should be traveling at about 15 to 20 mph — close to the speed you ride your bicycle.
Most roundabouts will give you two options if you’re not comfortable riding like a car:
Walk like a pedestrian.
If you are uncomfortable riding in traffic in the roundabout, dismount and exit the approach lane before the splitter island, and move to the sidewalk. Once on the sidewalk, walk your bicycle like a pedestrian.
Use a shared bicycle-pedestrian path.
Some roundabouts have a widened sidewalk or a shared bicycle-pedestrian path that runs around the roundabout outside of the circular roadway. Be courteous to pedestrians and yield to them.