The highway begins at an intersection with NM 111 and travels west to the national forest boundary. State Road 581 State Road 581 (NM 581) is a long state highway located entirely in Rio Arriba County. The highway begins at an intersection with NM 369 and travels southeasterly to its eastern terminus at NM 399. State Road 597 State Road 597 (NM 597) is a long state highway located entirely in San Juan County. The highway begins at an intersection with U.S. Route 160 in the south, and heads northwest to the Four Corners Monument. State Road 615 State Road 615 (NM 615) is a long state highway located entirely in Cibola County. The highway begins at Victor Avenue, and proceeds northwesterly through an interchange with Interstate 40 to the highways eastern terminus at NM 122. State Road 2001 State Road 2001 (NM 2001) was a long state highway located entirely in Alamogordo. The highway began at Scenic Drive and ended at the New Mexico Museum of Space History. NM 2001 was one of the few "orphan" routes in the State Road system, as it did not connect to any other State Road. The number appears to be a reference to the book 2001: A Space Odyssey by Arthur C. Clarke. The exact dates of existence are unknown, but the highway was established in the 1990s and the signage remained present as of 2008. The only hints to NM 2001 being retired is the absence of the route from current NMDOT highway logs. The official website for the Space Museum still lists its address at "Highway 2001". See also List of longest state highways in the United States References State Roads New Mexico