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In page National Road:

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In the mid-19th century[citation needed], a turnpike extension to Baltimore was approved—along what is now Maryland Route 144 from Cumberland to Hancock, US 40 from Hancock to Hagerstown, Alternate US 40 from Hagerstown to Frederick, and Maryland Route 144 from Frederick to Baltimore. The approval process was a hotly debated subject because of the removal of the original macadam construction that made this road famous.