The ones I've seen are really more of a half-hearted traffic-calming measure than proper roundabouts. The intersections I can think of, they're in residential n

The ones I've seen are really more of a half-hearted traffic-calming measure than proper roundabouts. The intersections I can think of, they're in residential neighborhoods and there's just some new island in the middle of a four-way stop. It might be impossible to widen these into proper roundabouts due to the houses up to the property lines?