New Mexico State Road 478

State Road 478
NM 478 highlighted in red
Route information
Maintained by NMDOT
Length	24.342 mi[1] (39.175 km)
Existed	1956[2]–present
History	The entire highway is a former section of US 80 and US 85
Major junctions
South end	NM 460 in Anthony
Major intersections	NM 192 / NM 228 in Mesquite I-10 / NM 188 in Las Cruces NM 28 in Las Cruces
North end	US 70 in Las Cruces
Location
Country	United States
State	New Mexico
Counties	Doña Ana
Highway system
New Mexico State Highway System Interstate US State Scenic
← NM 475 → NM 480

State Road 478 (NM 478) is a 24.342-mile-long (39.175 km) state highway located entirely within Doña Ana County, New Mexico. Starting in Anthony and ending in Las Cruces, NM 478 was once a section of historic US 80, a major transcontinental highway between San Diego, California and Savannah, Georgia. In 1946, it also became part of U.S. Route 85, when the latter highway was extended south to the Mexican border in El Paso, Texas. US 80 and US 85 were rerouted onto a newer alignment to the east in the mid 1950s. This was also around the time the older highway was designated NM 478. For two years, the southern terminus of NM 478 also served as the national western terminus of US 80 until that highway was removed from New Mexico completely in 1991. Today, NM 478 remains on much the same route it has since it was first designated and serves several old US 80/US 85 communities long since bypassed by I-10