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Interstate 370

Interstate 370 marker

Interstate 370
Route information
Auxiliary route of I-70
Maintained by MDSHA
Length: 2.54 mi (4.09 km)
Existed: 1988 – present
Major junctions
West end: Sam Eig Highway/Washingtonian Boulevard in Gaithersburg
  I-270 in Gaithersburg
MD 355 near Rockville
East end:
MD 200 in Gaithersburg
Location
Counties: Montgomery
Highway system
MD 368 MD 370

Interstate 370 marker

Interstate 370 (I-370) is a 2.54-mile (4.09 km) Interstate Highway spur route off I-270 in Gaithersburg, Maryland to the western end of toll road Maryland Route 200 (MD 200, Intercounty Connector) at an interchange that provides access to the park and ride lot at the Shady Grove station on the Red Line of the Washington Metro. Despite the number, I-370 does not connect to I-70 itself. The road continues to the west of I-270 as Sam Eig Highway, a surface road. Along the way, I-370 has interchanges with MD 355 and Shady Grove Road. The freeway was completed in the late 1980s to connect I-270 to the Shady Grove Metro station. I-370 was always part of the planned Intercounty Connector, but was the only segment to be built at the time. The opening of MD 200 east of I-370 resulted in the truncation of I-370 to the interchange with MD 200 and the re-designation of the road leading into the Shady Grove Metro station as MD 200A.

I-370 begins a short distance to the west of the I-270 interchange in Gaithersburg, Montgomery County, heading northeast as a six-lane freeway. Southwest of this interchange, the road continues as Sam Eig Highway (named after Washington real estate developer Sam Eig) which interchanges with Washingtonian Boulevard before becoming a surface road. The highway passes woods to the northwest and a shopping center to the southeast as it reaches an interchange with I-270. From this point, I-370 turns east and runs between residential neighborhoods to the north and business parks to the south, with trees separating the road from these areas. The freeway curves northeast again and comes to the MD 355 interchange. Past this, the highway passes more commercial development before reaching a bridge over CSX's Metropolitan Subdivision. A short distance later, I-370 comes to a trumpet interchange with MD 200A, a road that provides access to Shady Grove Road and the Shady Grove station of Washington Metro's Red Line. At this point, I-370 ends and the freeway continues east as MD 200 (Intercounty Connector).


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