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Interstate 370: Wikis


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From Wikipedia, the free encyclopedia

Interstate 370
Auxiliary route of the Interstate Highway System
Length: 3.13 mi[1] (5.04 km)
Formed: 1990s
West end: Sam Eig Highway & Washingtonian Boulevard in Gaithersburg
I-270 in Gaithersburg
MD 355 near Rockville
East end: Shady Grove Metro Station
Highways in Maryland
< MD 368 MD 370 >
State highways - Minor - Former - Turnpikes
I-370 at MD 355, from top-left to center-right

Interstate 370 (abbreviated I-370) is a 3.13-mile (5.04 km) Interstate Highway spur route off Interstate 270 in Gaithersburg, Maryland to a park and ride lot at the Shady Grove station on the Red Line of the Washington Metro. Despite the number x70, I-370 does not connect to I-70 itself.


Route description

The route is a four-lane freeway that begins at the eastern terminus of the Sam Eig Highway, at its intersection with Washingtonian Blvd. The route continues east and intersects I-270 almost immediately. Beyond I-270 the road continues east and interchanges with Maryland Route 355 before curving sharply south to the station.

The I-370 designation officially ends outside the station environs, but the physical roadway runs in a full loop through the station parking lot. I-370 officially opened in August 1989; between its completion and official opening, commuters used the highway as an overflow parking lot.


As of 2008, Maryland Route 200, also known as the Intercounty Connector, is currently under construction. When completed, it will run from I-370 east to Interstate 95 and U.S. Route 1 in Laurel.

Exit list

County Location Mile Destinations Notes
Montgomery Gaithersburg 0.0 Sam Eig Highway west — to MD 119 (Great Seneca Highway) Begins at eastern end of Sam Eig Highway
0.4 I-270 (Eisenhower Memorial Highway) – Frederick, Washington D.C.
1.8 MD 355 (Frederick Road) – Rockville Former route of US 240
MD 200 east (Intercounty Connector) – Laurel Interchange projected to open in 2010
Shady Grove Rd. - to Midcounty Highway Last exit before Metro station
3.1 Shady Grove Metro Station - Washington Metro Roadway loops through station area




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