Maryland Route 45 information

Maryland Route 45
Maryland Route 45 highlighted in red
Route information
Maintained by MDSHA and Baltimore DOT
Length	30.06 mi[1][2] (48.38 km)
Existed	1957–present
Tourist routes	Horses and Hounds Scenic Byway Mason and Dixon Scenic Byway
Major junctions
South end	US 1 / US 40 Truck in Baltimore
Major intersections	MD 146 in Towson I-695 in Towson MD 131 in Lutherville MD 145 in Cockeysville MD 138 in Hereford MD 137 in Hereford I-83 in Parkton MD 439 in Maryland Line
North end	SR 3001 at the Pennsylvania state line in Maryland Line
Location
Country	United States
State	Maryland
Counties	City of Baltimore, Baltimore
Highway system
Maryland highway system Interstate US State Scenic Byways
← MD 43 → MD 47

Maryland Route 45 (MD 45) is a state highway in the U.S. state of Maryland. Known for most of its length as York Road, the state highway runs 30.06 miles (48.38 km) from U.S. Route 1 (US 1)/US 40 Truck in Baltimore north to the Pennsylvania state line in Maryland Line, where the highway continues as State Route 3001 (SR 3001). MD 45 is the primary highway between Downtown Baltimore and Towson, the county seat of Baltimore County. North of Interstate 695 (I-695), the state highway parallels I-83 and serves the suburban communities of Lutherville, Timonium, Cockeysville, and Hunt Valley. MD 45 also connects the northern Baltimore County communities of Hereford and Parkton. The state highway is maintained by the Maryland State Highway Administration in Baltimore County and by the Baltimore City Department of Transportation in the city, where the highway also follows Greenmount Avenue.

York Road, which follows the path of an 18th-century wagon road and 19th century turnpike, was one of the original state roads marked for improvement by the Maryland State Roads Commission in 1909. The state highway was constructed as an all-weather road in the mid-1910s from Baltimore to Hereford. The remainder of York Road to Maryland Line was built in the late 1910s and early 1920s. York Road was designated as part of US 111 in 1927 and widened to handle the increasing traffic load in the late 1920s. York Road became a secondary route when a freeway was constructed from Baltimore to York and Harrisburg in the 1950s. US 111 was moved to this freeway as sections opened; the old road became MD 45. MD 45 fully replaced US 111 on York Road when the U.S. Highway was replaced by I-83 in the early 1960s.