Several special routes of U.S. Route 54 exist, from New Mexico to Missouri. In order from southwest to northeast, separated by type, they are as follows.
New Mexico
U.S. Highway 54 Business runs from exit 329 along I-40 / US 54 southwest of Tucumcari to US 54 near Tucumcari Lake. The business route follows Main Street through the city.
References
Special routes of U.S. Route 54 Wikipedia(Text) CC BY-SA