The Federal Highway Administration (FHWA) defines a roundabout as a type of circular intersection with yield control of entering traffic, islands on the approaches, and appropriate roadway curvature to reduce vehicle speeds.
Modern roundabouts are different from rotaries and other traffic circles. For example, roundabouts are typically smaller than the large, high-speed rotaries still in use in some parts of the country. In addition, roundabouts are typically larger than neighborhood traffic circles used to calm traffic. At a modern roundabout, entering traffic yields rather than stops to allow more efficient traffic flow through the intersection.
Some common questions and answers about roundabouts:
A new LCTV video, "Modern Roundabouts of Lake County" discusses this type of intersection and roundabout locations in Lake County. Watch it now (9 min)
Watch an LCTV video to learn how to navigate a roundabout.
Roundabout Locations in Lake County: