Roundabouts
A roundabout is an intersection where traffic travels around a central island in a counterclockwise direction. Vehicles entering or exiting the roundabout must yield to vehicles, bicyclists, and pedestrians.  When you approach a roundabout:

• Slow down as you approach the intersection.  (15 MPH throughout Ladera Ranch)
• Yield to pedestrians and bicyclists crossing the roadway.
• Watch for signs and pavement markings that guide you or prohibit certain movements.
• Enter the roundabout when there is a big enough gap in traffic.
• Drive in a counter-clockwise direction. Do not stop or pass other vehicles.
• Use your turn signals when you change lanes or exit the roundabout .
• If you miss your exit, continue around until you return to your exit.
• For roundabouts with multiple lanes, choose your entry or exit lane based on your destination.

For example, to: Turn right at the intersection, choose the right-hand lane and exit in the right-hand lane. (Blue car) Go straight through the intersection, choose either lane, and exit in the lane you entered. (Red car) Turn left, choose the left lane, and exit. (Yellow car)

Source:  DMV, 2005 California Drivers Handbook