U.S. Route 40 Alternate (Hagerstown–Frederick, Maryland)

U.S. Route 40 Alternate
U.S. Route 40 Alternate highlighted in red
Route information
Alternate route of US 40
Maintained by MDSHA and City of Hagerstown
Length:	22.97 mi (36.97 km)
Existed:	1952 – present
Tourist routes:	Historic National Road Antietam Campaign Scenic Byway
Major junctions
West end:	Potomac Street in Hagerstown
	MD 68 in Boonsboro MD 66 in Boonsboro MD 34 in Boonsboro MD 67 in Boonsboro MD 17 in Middletown I-70 near Frederick
East end:	US 40 in Frederick
Location
Counties:	Washington, Frederick
Highway system
United States Numbered Highway System List Special Divided Replaced Maryland highway system Interstate US State Scenic Byways

U.S. Route 40 Alternate (US 40 Alternate) is an alternate route of US 40 in the U.S. state of Maryland. The highway runs 22.97 miles (36.97 km) from Potomac Street in Hagerstown east to US 40 in Frederick. US 40 Alternate parallels US 40 and much of Interstate 70 (I-70) to the south through eastern Washington County and western Frederick County. The alternate route connects Hagerstown and Frederick with Funkstown, Boonsboro, Middletown, and Braddock Heights. US 40 Alternate crosses two major north–south components of the Blue Ridge Mountains that separate the Great Appalachian Valley and the Piedmont: South Mountain between Boonsboro and Middletown and , which is locally known as Braddock Mountain, at Braddock Heights.