Route 403, also known as the Quonset Freeway, is a numbered state highway located in Washington County and Kent County, Rhode Island, United States. The route is a nominally east–west limited-access freeway for its entire length. A spur of Rhode Island Route 4, Route 403 serves Davisville and the Quonset Business Park, providing freeway access to Interstate 95 and the northern Providence metropolitan area from the industrial zone. The western terminus of the freeway is at a trumpet interchange with Route 4 in East Greenwich. The route has three unnumbered interchanges along its 4.5-mile (7.2 km) length, including a junction with U.S. Route 1 in North Kingstown, before terminating at an at-grade intersection with Roger Williams Way and Commerce Park Road in Quonset. Route 403 is the highest