U.S. Highway 240
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U.S. Highway 240 is a defunct designation for a short, but once very-important, segment of highway between Frederick, Maryland, junction U.S. Highway 40 (since diverted to Interstate 70) and Washington, D.C., junction of what was the now-diverted U.S. Highway 50 through Rockville and Bethesda. It took a route very close to a northwest-southeast path as a spur of its long-distance 'parent' U.S. Highway 40 which leads eastward (and still exists) to Baltimore.
A freeway first designated as Interstate 70S (now Interstate 270) supplanted US 240 between Frederick and the Capitol Beltway (Interstate 495) in the Maryland suburbs of Washington; in Maryland, the whole of US 240 was redesignated as Maryland State Highway 355 around 1970. In Washington, DC, it became the surface street Wisconsin Avenue. Signs for US 240 within Washington existed at least into the early 1970s.
US 240 was diverted to what would become Interstate 270 before being decommissioned.