N.M. Code R. § 18.19.8.83
An escort vehicle or a person other than the driver of the permitted vehicle may be required to accompany the movement of a vehicle, combination or load that exceeds a height of 16 feet. The escort or additional person shall make immediate height clearance verifications at each overhead clearance prior to the over-height vehicle moving through the clearance. The requirement for an additional escort or person will be stated on the special permit.
[18.19.8.83 NMAC - Rp, 18.19.8.110 NMAC, 2/12/2016; A, 6/1/2022]