Boonsboro lies on what used to be the National Road. Today it is known as either the Old National Pike or Alt-U.S. 40. In Boonsboro it is Main Street. The route was originally established as a road improvement project in 1758 to shorten travel between Fredericktown and Fort Frederick during the Seven Years' War. The route began from the existing (old) road at today's Marker road, passed through Turner's Gap, Boonsboro and turned west along today's MD. Rt. 68 to Williamsport. The route from Boonsboro to Funkstown was later adopted as part of the National Turnpike route.