The Potomac and Rappahannock Transportation Commission (PRTC), operating as OmniRide, provides a variety of services in Princ ... e William County, Stafford County, the City of Manassas and the City of Manassas Park including: OmniRide Express and OmniRide Local bus routes; OmniRide Ridesharing for the promotion of carpools and vanpools; and OmniRide Employer Services which helps businesses to implement and expand commuter benefit programs. PRTC also co-sponsors the Virginia Railway Express in partnership with the Northern Virginia Transportation Commission. read more