Carmel, Indiana has over 150 roundabouts and they are building more. I believe we have less than 5 traffic light intersections now but I'm not 100% sure.

The movement around Carmel is remarkable compared to driving next cities (Indy, Fishers, etc). Fishers and Westfield are building more roundabouts as well.

As for one person who commented about high traffic locations - Carmel would make an overpass for those intersections though they are not many.