For federal-aid and state highway improvement projects, plans and specifications must be in compliance with the latest version of the department's design manual. For non federal-aid projects, the applicant shall certify that the project complies with the design manual. All construction plans shall be signed and dated by a professional engineer registered in New Mexico. The department may require that certain standards and procedures be used in making any change orders.
N.M. Admin. Code § 2.40.30.16