The Silver Line has two primary goals. The first is to link Washington, D.C. by rail to Washington Dulles International Airport and the edge cities of Tysons, Reston, Herndon, and Ashburn. The second is to spur urban development in Tysons and reduce overall reliance on highway traffic in the business district, Virginia's largest and the 12th-largest in the country. The district's area is comparable in size to downtown Washington, D.C., but is rather insulated from its surrounding neighborhoods and its streets have no existing grid pattern. The Silver Line also improves public access to the Udvar-Hazy Center, an annex of National Air and Space Museum located near Dulles Airport; after the opening of the first phase of the Silver Line, Fairfax Connector began running shuttles to the museum from .