This regulation does not apply to a: Class G (trailer) vehicle registered or capable of being registered under Transportation Article, §13-927, Annotated Code of Maryland, provided no part of the load is within 6 inches of the top of any of the enclosures the load touches; Construction vehicle working within the confines of a public works construction work project site as outlined in the construction project's plans and specifications, provided the distance traveled does not exceed 1 mile or the distance specified in an extension granted by the Maryland Department of Transportation; Construction vehicle or mining equipment while crossing a highway between construction or mining sites; or Vehicle, within the Port of Baltimore for a distance not to exceed 1 mile, carrying a load of loose material between a stockpile or storage facility and a vessel docked at the Port. A vehicle carrying loose material which is within 6 inches of the top of any of the enclosures the loose material touches, shall have the loose material covered by a firmly attached canvas or similar type covering. The requirements of this regulation apply only to the issuance and certification of a safety equipment repair order and do not apply to a complete inspection required upon sale or transfer of ownership of a used vehicle. A safety equipment repair order may be certified only if the cover is present, fully covers the top of the bed, and meets the requirements of this regulation.