N.M. Admin. Code § 18.31.6.10
The regulation and management of vehicular access to and from the New Mexico state highway system shall be defined by an access categorization system. The access categorization system for state highways is described in Section 10 of the state access management manual. The access categorization system shall be based on the functional classified system for New Mexico roadways, which consists of interstates and freeways (INTS), principal arterials (PRAR), minor arterials (MNAR), major collectors (MJCL), minor collectors (MNCL), collectors (COLL), local roads (LOC), and other special road types. The functional classified system shall be further defined as urban and rural routes based on the location of a highway with respect to population centers. The current classification of a highway shall be obtained from the department and shall be used to determine the access category applicable to the highway under consideration. Access requirements for each access category are described in the state access management manual.
N.M. Admin. Code § 18.31.6.10