it was the largest interchange complex in the world. There are currently 52 lane-miles of roadways and ramps, with four freeway junctions and numerous local ramps, and with several interchanges to the reversible express (HOV) roadway, all within a section of the Shirley Highway. I-95, I-395 From 1965 to 1975, the Shirley Highway was reconstructed to Interstate Highway System standards. As portions were completed, they were designated as Interstate 95. Original plans called for I-95 to cut straight through Washington, D.C., and connect with the Capital Beltway (I-495) in Maryland. However, community opposition halted this plan in 1977, diverting planned funding to construction of the Washington Metro subway system. Because of the cancellation of the originally-proposed section of I-95 from New York Avenue in the District of Columbia, northward into Prince George's County to Interstate 495, the Capital Beltway, the I-95 designation was rerouted onto the eastern half of the Beltway. The remaining portion of the Shirley Highway north of Springfield was redesignated Interstate 395, which continues into D.C. to its end at U.S. Route 50 (New York Avenue). Shirley Busway On September 22, 1969, the reversible roadway between Edsall Road and SR 7 was converted to the first separated bus rapid transit (BRT) route on an Interstate highway during peak morning commute hours (0630–0930); this was extended north to Shirlington the next day. The busway was extended to north of Glebe Road in September 1970, and then to the new Center Span Bridge on April 5, 1971. The Shirley Highway Express Bus-on-Freeway Project was implemented from June 1971 to the end of 1974, demonstrating that BRT on a highway was a feasible way to boost public transit ridership and on-time performance. However, compared to the Lindenwold High Speed Line, a light rail service of comparable distance serving approximately the same number of people, Prof. Vukan R. Vuchic found the Shirley Busway had fewer riders and revenue. Springfield Interchange The roots of the Springfield Interchange began with the Shirley Highway. This jumble of highways in Springfield, Virginia, where I-395, I-95, and the Capital Beltway meet, is officially called the "Springfield Interchange." It is colloquially referred to as the "Mixing Bowl," but highway officials still use that terminology to refer to the interchange complex at the Pentagon (see Pentagon road network). Exit list References External links Kurumi Roads website Roads to the Future website Virginia Department of Transportation (VDOT) website Monuments