Interstate 66 (I-66) is a highway in the eastern United States that goes through the states of Virginia and District of Columbia in an east–west direction. The stretch in Virginia has a length of 74.8 miles, almost the entire length of the freeway. The road, also known as Custis Memorial Parkway, goes through the counties of Frederick, Warren, Fauquier, Prince William, Fairfax and Arlington.
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