Route information | |||||||
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Length | 76.28 mi[1] (122.76 km) | ||||||
Existed | 1961–present | ||||||
NHS | Entire route | ||||||
Restrictions | No trucks on Custis Memorial Parkway or Theodore Roosevelt Bridge | ||||||
Major junctions | |||||||
West end | I-81 in Middletown, VA | ||||||
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East end | US 29 in Washington, D.C. | ||||||
Location | |||||||
Country | United States | ||||||
States | Virginia, District of Columbia | ||||||
Counties | VA: Frederick, Warren, Fauquier, Prince William, Fairfax, Arlington DC: City of Washington | ||||||
Highway system | |||||||
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Interstate 66 (I-66) is a 76.32 mile east–west Interstate Highway in the eastern United States. The highway runs from an interchange with I-81 near Middletown, Virginia, on its western end to an interchange with U.S. Route 29 (US 29) in Washington, D.C., at the eastern terminus. The route parallels State Route 55 (SR 55) from its western terminus at I-81 to Gainesville, and US 29 from Gainesville to its eastern terminus in Washington. I-66 has no physical or historical connection to US 66, which was located in a different region of the United States.
The E Street Expressway is a spur from I-66 into the Foggy Bottom neighborhood of Washington, D.C.