Interstate 66 and United States Route 50 join for a half mile to cross the Potomac River in Washington, DC.

Dan Moraseski 6/4/04
Westbound on I-66 at the merge with US 50. The duplex begins here on the east side of the Theodore Roosevelt Bridge.

Dan Moraseski 6/4/04
Toward the west side of the bridge, US 50 exits, still in the District of Columbia. I-66 continues westward toward Manassas, while US 50 parallels the freeway on its way to Winchester.