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 , 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 numbered route in Rh