The roundabouts here are usually in higher traffic areas so there is an elevated sidewalk with a bike lane around it. Usually if there is a bike lane on the road leading up to the intersection, maybe 100 meters before the bike lane will merge onto the sidewalk, which then either turns into a zebra crosswalk or a traffic signal if the bicycle needs to cross the intersections.

On small rural roads with lower traffic there are no sidewalks but I rarely meet cars at the circle. If I do, the drivers usually respect right of way and no passing in the circle, probably because there is higher ridership here and people are more tolerant of bicycles.