We've got one where the circle is tangent to the street centerline if you can picture that. The high school wasn't giving up an inch of their athletic field so the whole mess is offset to the south.
Many of the roundabouts here replace 4-way stop intersections, or intersections that never had stop signs. Those work surprisingly well with people taking turns or yielding in a civilized manner.
However that does lead to the problem of people still treating them like
4-way stops. The small ones are really bad. If someone is entering 90 degrees to your left there isn't enough room to determine if he's going to exit on the street where you are, or go 180 degrees.Large trucks go straight through, as in running over the damn center section because no way are they going to make it on the pavement. They used to plant flowers in the center but gave up on that idea,