A deal has been reached to pay for the second phase of the Metrorail to Dulles International Airport project.
Transportation Secretary Ray LaHood said Virginia will commit $150 million in state funds, and the federal government will provide assistance to local governments and the Washington Metropolitan Airports Authority, which operates Dulles Airport
Future increases in tolls on the Dulles Toll Road will help pay for the project's $2.8 billion second phase.
Construction has already begun on the first phase, which extends Metro from Falls Church through Tysons Corner to Reston. That construction is expected to be completed in 2013.
The second phase runs from Wiehle Avenue in Reston to Ashburn in eastern Loudoun County. It is expected to be completed in 2016.
There are 11 new stations in phases one and two.
So far, there is no agreement on how to pay for the final stretch.