Interstate 270 travels 32.60 miles overall as a busy commuter route from Interstate 495 northwest to Interstate 70 and U.S. 40 at Frederick. The freeway sees a local/express roadway configuration from Exit 11 south to the split with I-270 Spur.

Interstate 270 Maryland Highway Guides

Oldest portions of Interstate 270 date back to the 1950s-expressway of U.S. 240 through Frederick County. The route became a part of Interstate 70S in 1956. U.S. 240 shifted from its surface route, which was redesignated Maryland 355, to a freeway southward from Frederick to the Capital Beltway near Chevy Chase. The US route overlapped with I-70S to its decommissioning in 1972.1

Interstate 270 initially consisted of just the freeway spur to I-495 west from I-70S south in Montgomery County. Interstate 70S was renumbered as I-270 in 1973 when AASHTO mandated that all suffixed routes be dropped from the Interstate system. This left the original I-270 as Interstate 270 Spur, a designation that remains in place today.1

Plans for Interstate 70S envisioned a continuation of the route southward into the District of Columbia. Ultimately dropped, as were many other Washington urban freeways due to community opposition, I-270 ends at a wye interchange with the Capital Beltway opposite the exit with Maryland 355 (former U.S. 240 leading south into D.C.)


Interstate 270 scenes
Montrose Road meets Interstate 270 at a full cloverleaf interchange by the Park Potomac master planned community. Initially the interchange was without the loop ramp onto Montrose Road west from I-270 north and the direct ramp from Montrose Road east onto I-270 south. Photo taken 08/04/13.
A loop ramp departs Montrose Road west to join the local lanes of Interstate 270 south ahead of the split with I-270 Spur. A second loop ramp follows from Montrose Road for Park Potomac Avenue. Photo taken 08/04/13.
Maryland 85 (Buckeystown Pike) northbound within the parclo interchange at Interstate 270 (Exit 31). The surface arterial meets the freeway adjacent to the Francis Scott Key Mall, south of Frederick. Photo taken 08/04/13.
Interstate 270 north ends one mile north of Maryland 85 at Interstate 70 and U.S. 40. U.S. 40 overtakes the freeway northward to U.S. 15 through Frederick while I-70 skims southern reaches of the city between Hagerstown and Baltimore. Photo taken 08/04/13.
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2 photos
The on-ramp to Interstate 270 north for U.S. 15 north and Interstate 70 & U.S. 40 departs Maryland 85 (Buckeystown Pike) north. Maryland 85 continues another mile north to Maryland 355 (Urbana Pike / historic U.S. 240) ahead of I-70 (Exit 54). Photos taken 08/04/13.
Spectrum Drive encircles Francis Scott Key Mall east from Maryland 85 (Buckeystown Pike) within vicinity of I-270. Photo taken 08/04/13.
Approaching Interstate 270 along Maryland 85 (Buckeystown Pike) south of Frederick. Originally a full cloverleaf interchange joined the two routes, but the loop ramps from MD 85 to I-270 were removed. Photo taken 08/04/13.
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2 photos
Drivers depart Maryland 85 (Buckeystown Pike) south for the final mile of Interstate 270 north to Interstate 70, U.S. 15 and U.S. 40. Photos taken 08/04/13.
Passing under the Interstate 270 mainline, MD 85 nears the southbound on-ramp to Germantown, Gaithersburg, Rockville and Washington, DC. Photo taken 08/04/13.
Maryland 85 (Buckeystown Pike) continues south through additional retail areas from I-270 to a number of industrial parks ahead of Lime Kiln. I-270 angles southeast across the Monocacy River to Urbana. Photo taken 08/04/13.

Sources:

  1. MDRoads: I-270


Photo Credits:

08/04/13 by AARoads

Connect with:
Interstate 70
Interstate 370
Interstate 495 - Capital Beltway
U.S. 40

Page Updated 06-07-2014.