A ring road (also called a beltway, orbital road, or circumferential road) is a major road or highway that goes around the outside of a city or town, forming a circular or semi-circular route. It is designed to divert traffic away from the city center and connect different parts of the city without the need to pass through the inner areas.
Sign indicating R0 ring road. (Brussels, Belgium) © Wikimedia.org/Aktron, CC BY