Marked east-west.

SHA I-70 strip map with interchange details, 1976.

A section near MD 615 east of Hancock, and the original Frederick US 40 Bypass were completed by 1961. By the mid 60s, I-70 was complete between Frederick and Hagerstown. The bypass of the built-up parts of US 40 west of Baltimore to I-695 was completed by 1970 as I-70N. In 1973, I-70N changed to just I-70, I-70S becoming I-270. US 40 from east of Frederick to Ellicott City was upgraded to limited access in stages during the late seventies. As late as 1985, there were at-grade intersections on I-70 a few miles to the east of Frederick, roughly Exits 56-59, and this was upgraded by the early nineties.

I-70 was supposed to end at I-95 just east of Caton Ave. (Exit 50) and there were 'suicide ramps' there until they were removed a few years ago. I-70 through Baltimore City was killed due to community concern about its course through Leakin Park and along the Gwynns Falls. Also killed was the western part of its spur, I-170, that had not already been built. The section completed along the Franklin-Mulberry corridor (US 40 west and east bound, respectively) was redesignated US 40 in 1989. I-70 now ends at a park & ride at the city line.

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