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In page National Road:

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The road's route between Baltimore and Cumberland continues to use the name National Pike or Baltimore National Pike and as Main Street in Ohio today, with various portions now signed as US 40, Alt. US 40, or Maryland Route 144. A spur between Frederick, Maryland, and Georgetown (Washington, D.C.), now Maryland Route 355, bears various local names, but is sometimes referred to as the Washington National Pike;[citation needed] it is now paralleled by I-270 between the Capital Beltway (I-495) and Frederick.