Potomac and Rappahannock Transportation Commission (PRTC) is the transportation system serving Prince William County and the cities of Manassas and Manassas Park in Virginia. PRTC operates two services. OmniRide is a commuter bus service operating from Prince William County to downtown Washington, DC and other employment centers in Northern Virginia. OmniLink is the local bus service within Prince William County, operating both fixed routes and demand-response service. PRTC was established in 1986.