Lilyfestre, a roundabout or road island is a road junction, no set number of roads, but a circular island around which the traffic flows.
It has to be properly designed, size depending on the number of roads, and unrestricted visibility on the approaches.
They frighten the uninitiated, but they work well when you are used to them. Every entry is a judgement call, filtering into the on-island traffic. Oddly enough, there seem to be fewer accidents at roundabouts than traffic lights, because you have to be alert.

The crack about Americans was because our local traffic manager is one, highly qualified, too, and traffic lights are proliferating like buttercups. I hate waiting for an empty road, just because the light is on a cycle.

Roundabouts featured in a thread recently. Europeans pro, some Americans anti.