WASHINGTON — The board of the Metropolitan Washington Airports Authority voted Wednesday to increase rates on the Dulles Toll Road in 2013 and 2014, a move it defended as necessary to finance part of the mostly bond-funded and highly controversial Silver Line rail extension to the Dulles International Airport.

The current rate of $1.50 at the main toll plaza and 75 cents on ramps will rise to $1.75 and $1.00 respectively in January. The main plaza will see an additional increase to $2.50 in January 2014.

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