Knoxville Road was designated MD 478 by 1971. MD 464's roundabout at US 15 was constructed in 2009. The state highway's bridge over Catoctin Creek was replaced in 2010 and 2011.
Knoxville Road was designated MD 478 by 1971. A circular interchange at US 15, which is part of the state highway system (MD 464), was built in 2009. The bridge over Catoctin Creek, also on the state highway, was replaced in 2010 and 2011.