 Near the MD 55 intersection is a stone arch bridge which was initially built in 1812 and rebuilt in the 1830s, and carried the National Road over Braddock Run, a tributary to Wills Creek.East of Clarysville, the highway passes through a gap carved by Braddock Run between Piney Mountain and Dan's Mountain.I-68, having been built later, is located on the hillside above Alt US 40, on the Dan's Mountain side of the gap.