§47-1-107.4.

§47-1-107.4.
   
   A. A Class D motor vehicle is any motor vehicle or combination of
   vehicles, regardless of weight, which:
   
   1. Is marked and used as a firefighting vehicle or a law enforcement
   emergency response vehicle;
   
   2. Is designed and used solely as a recreational vehicle;
   
   3. Is a single or combination vehicle with a gross combined weight
   rating of less than twenty-six thousand one (26,001) pounds; or
   
   4. Is a single or combination farm vehicle with a gross combined
   weight rating of more than twenty-six thousand one (26,001) pounds if:
   
   a. it is entitled to be registered with a farm tag and has a farm tag
   attached thereto, and
   
   b. it is controlled and operated by a farmer, his family or his
   employees, and
   
   c. it is used to transport either agricultural products, farm
   machinery, farm supplies or any combination of those materials to or
   from a farm, and
   
   d. it is not used in the operations of a common or contract motor
   carrier, and
   
   e. it is used within one hundred fifty (150) air miles of the person's
   farm or as otherwise provided by federal law.
   
   B. The Department of Public Safety shall provide by rule promulgated
   pursuant to the Administrative Procedures Act, Section 250 et seq. of
   Title 75 of the Oklahoma Statutes, that, in addition to the
   requirements specified in paragraph 4 of subsection A of this section,
   a motor vehicle or combination of vehicles operated by persons engaged
   in custom farming operations or persons operating farm retail outlets
   or such person's employees, and used within one hundred fifty (150)
   air miles of the temporary base of operations of a person engaged in
   custom farming operations, shall be considered to be a Class D motor
   vehicle if the inclusion of such vehicle within the definition of a
   Class D motor vehicle will not result in the loss of federal funds to
   the State of Oklahoma pursuant to federal law or regulation.
   
   C. In addition to vehicles described in subsection A of this section,
   the Department of Public Safety may provide by rule promulgated in
   accordance with the Administrative Procedures Act, Section 250 et seq.
   of Title 75 of the Oklahoma Statutes, that any motor vehicle or
   combination of vehicles regardless of weight, which is marked and used
   as a state, county or municipal vehicle, may be included within the
   definition of a Class D motor vehicle if such inclusion will not
   result in the loss of federal funds to the State of Oklahoma pursuant
   to federal law or regulation.
   
   D. Provided, further, a Class D Motor Vehicle shall not include any
   vehicle which is:
   
   1. Designed to carry sixteen or more passengers, including the driver;
   or
   
   2. Required to be placarded for hazardous materials under 49 C.F.R.,
   Part 172, subpart F; provided, the Department of Public Safety shall
   provide by rule promulgated pursuant to the Administrative Procedures
   Act, Section 250 et seq. of Title 75 of the Oklahoma Statutes, that a
   farm vehicle or a vehicle being operated by a person operating a farm
   retail outlet or such person's employee, which is required to be
   placarded for hazardous materials under 49 C.F.R., Part 172, subpart
   F, shall be considered to be a Class D motor vehicle if the inclusion
   of such vehicle within the definition of a Class D motor vehicle will
   not result in the loss of federal funds to the State of Oklahoma
   pursuant to federal law or regulation.