roundabout; traffic circle; rotary
A circular intersection where traffic flows around a central island. In Japan, this term is used in official traffic contexts, though physical roundabouts are less common than in some other countries.
See also: ロータリー
The roundabout in this town is known for reducing accidents.
At a roundabout, the rule is to go clockwise.
環状交差点 is the formal traffic-law term for a roundabout, while ロータリー is the everyday loanword for the same kind of circular intersection.
Compound of 環状 (kanjō, 'ring-shaped') + 交差点 (kōsaten, 'intersection'). A relatively modern term adopted in official traffic terminology.