A traffic circle is a traffic control system that allows traffic to move through a multi-street intersection continuously around a circular center island median. Traffic circles are very common in Tijuana, Baja California, and were found throughout New England and the state of New Jersey. These differ from roundabouts in that they are larger radius and usually multi lane in width. Somerville Circle in New Jersey, where U.S. 202, U.S. 206 and NJ 28 come together, is a good example of one.