Metrobus is the Washington, D.C. area's regional bus system. Within Arlington, Metrobus is supplemented by ART-Arlington Transit to provide bus service throughout the County.
Metrobus Route 5A operates between L'Enfant Plaza Metro station in Washington, D.C. and Washington Dulles International Airport, with a stop at the Rosslyn Metro station in Arlington. Other stops include Tysons-Westpark Transit Station and the Herndon-Monroe Park & Ride Lot.