 It would then follow SR 621 east of Manassas National Battlefield Park, ultimately connecting to Loudoun County Parkway.The project would link Loudoun, Fairfax, and Prince William Counties and provide an alternate route between Manassas, I-66 and Washington Dulles International Airport.Some Prince William County supervisors support construction to extend Godwin Drive, as opposed to the Tri-County Parkway, due to the lower cost and lesser disruptive impact on residents and businesses.