<P> Although construction was planned to begin in 2005, the delays in approval of funding pushed back the start date . To facilitate Silver Line construction, responsibility for the project was transferred on November 1, 2008, from the Virginia Department of Transportation (VDOT) to the MWAA . Utility relocation work began in 2008, and construction began on March 12, 2009 . </P> <P> The extension runs in its own right - of - way on a route similar to that of the Dulles Access Road, running both at grade and via aerial structures . The only significant diversions from the access road route are for the stops in Tysons Corner and at Dulles International Airport, where the Metro is currently planned to alternate between subway and elevated track to maintain the exclusive right - of - way . </P> <P> Service on Phase I of the Silver Line opened on July 26, 2014 between Wiehle--Reston East and Largo Town Center, with five new stations being added to the existing network west of East Falls Church . The full line to Ashburn, including a station at Dulles International Airport, is expected to be completed in 2018 . </P> <P> One lane of southbound Virginia Route 123 in Tysons Corner was closed for a two - year period, starting on February 22, 2010, for construction of the McLean Metro station . The distance impacted was two blocks, from Scotts Crossing Road to the Capital Beltway . </P>

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