U.S. Route 101
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
New Mexico State Road 101
NM 101 first appears on 1940 roadmap, as a connector between State College (future NMSU) and US 80/US 85 south of Las Cruces. The road construction was probably related to the New Mexico State College introducing Air Mechanics Courses starting at some point prior to 1941. The Air Mechanics Building & the Hangar Lake Building both were erected in 1941 (according to plaques on the buildings), and State College Airport was constructed around the same time. In 1960s the road was extended further east to I-25. In 1988, the New Mexico Department of Transportation (NMDOT) went through a radical road renumbering program, and NM 101 was extended further west to NM 28. In 2001 a portion of this highway between South Main Street and Telshor Boulevard was transferred to the city of Las Cruces shortening NM 101 to its current length.