How Roundabouts Work

Approaching a Roundabout
On approaching a roundabout, decide as early as possible which exit you need to take and get into the correct lane. Reduce your speed. Bicyclists are vehicles and need to share the lane at intersections.

Therefore, allow bicycles to enter the roadway from any bicycle lane. The law gives pedestrians the right-of-way in a crosswalk. Yield to pedestrians waiting to cross or crossing on the approach. 
Approaching a Roundabout
Yielding in a Roundabout
Upon reaching the roundabout yield line, yield to traffic circulating from the left. Watch out for traffic already on the roundabout, especially cyclists and motorcyclists.

Do not enter a roundabout when an emergency vehicle is approaching on another leg; allow queues to clear in front of the emergency vehicle. 
Yielding in a Roundabout
Driving Within a Roundabout
Within a roundabout, do not stop except to avoid a collision; you have the right-of-way over entering traffic. Always keep to the right of the central island and travel in a counterclockwise direction.

Maintain a slow speed upon exiting the roundabout. Always indicate your exit using your right-turn signal. Watch for and yield to pedestrians waiting to cross, or crossing the exit leg.