Except for the provisions of subdivisions (1) and (2) of this subsection, the provisions of this section shall not apply to any commercial motor vehicle operated in intrastate commerce and licensed for a gross weight of sixty thousand pounds or less when used exclusively for the transportation of solid waste or forty-two thousand pounds or less when the license plate has been designated for farm use by the letter "F" as authorized by the Revised Statutes of Missouri, unless such vehicle is transporting hazardous materials as defined in Title 49, Code of Federal Regulations.
Nothing in this subsection shall be construed to prohibit persons designated by the department of public safety from inspecting vehicles defined in this subsection.
§ 307.400, RSMo