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Interstate 370 west
This access road in Derwood, Montgomery County, Maryland leads from Redland Road to the meeting of the east end of Interstate 370 and the west end of the tolled Maryland Route 200 freeway, which together form the 21-mile Intercounty Connector (ICC) running between Gaithersburg and Laurel in neighboring Prince George's County. This access road also collects traffic from the parking lot of the Shady Grove station of the Washington Metro, the northwest terminus of the system's Red Line. An interchange with Shady Grove Road, where I-370 extended to before the completion of MD 200, is up ahead. (12-1-2025)
A sweeping righthand ramp to MD 200 east is followed by a loop ramp which serves as the movement for westbound traffic onto I-370. Shady Grove Road has separate ramps leading to each route; the ramp to eastbound MD 200 bypasses the access road. (12-1-2025)
Up ahead, I-370 intersects Maryland Route 355 (Frederick Road) which has control cities of Montgomery seat Rockville and Gaithersburg at exit 2. In the distance, the highway then goes over CSX's Metropolitan Subdivision (the right-of-way of MARC's Brunswick Line), which the Red Line parallels from North Bethesda (and, on its other end, from Silver Spring to the Brentwood Yard in northeast Washington, DC). (12-1-2025)
This next overhead sign points the way to exit 2. (12-1-2025)
In one mile, I-370 will have an interchange with Interstate 270, which has control cities of Frederick and (via I-495 and MD 355) Washington. I-270 connects I-370 with their parent, I-70, at Frederick. (12-1-2025)
A cloverleaf ramp from MD 355 north reaches I-370 west as the Interstate passes over MD 355. (12-1-2025)
The ramps to each direction of I-270 are on opposite directions of the westbound carriageway; the ramp to I-270 south is on the left. (12-1-2025)
The highway soon completes a wide curve to the right. (12-1-2025)
Signage in the median reiterates that the movement to I-270 south is a left exit. (12-1-2025)
At I-270, through traffic is marked as going toward Sam Eig Highway. (12-1-2025)
The ramp to I-270 north, featuring a newly-installed ramp meter, is to the right. (12-1-2025)
I-370 ends at Fields Road in half a mile as the ramp from I-270 north to I-370 west passes overhead. (12-1-2025)
The ramp to I-270 south goes off to the left, and I-370 continues west as Sam Eig Highway toward Washingtonian Boulevard and the Washingtonian retail complex. (12-1-2025)