Traffic island and Traffic circle

Traffic island noun - A curbed area in a roadway from which traffic is excluded; provides safe area for pedestrians.

Traffic circle and traffic island are semantically related. In some cases you can use "Traffic circle" instead a noun phrase "Traffic island".

Traffic circle noun - A road junction at which traffic streams circularly around a central island.

Traffic island and traffic circle are semantically related. You can use "Traffic island" instead a noun phrase "Traffic circle".