I'm confused, all of the traffic circles I drive through were just intersections before, no speed bumps. And all of the speed bumps I encounter are in parking lots, and can't be replaced by a traffic circle.
Are there traffic circles that are primarily about slowing traffic rather than managing intersections?
Roundabouts are smaller than traffic circles and not designed the same.
Yes, there are some cross intersections that are turned into very tight roundabouts as speed control. They essentially just plonk an island in the center, and maybe cut the corners a bit to sort of round it out. Most people slow down when crossing them.