Tennessee Code Title 55. Motor and Other Vehicles § 55-9-212

(a) No person shall operate upon a public highway or street any motor vehicle, including a separate truck tractor (normally used in a tractor-trailer combination), or combination of vehicles having a carrying capacity in excess of three thousand pounds (3,000 lbs.), if the motor vehicle or combination of vehicles is not equipped with rear fenders, mudflaps or mudguards of such size as to substantially prevent the projection of rocks, dirt, water or other substances to the rear. The fenders, flaps or guards shall be of a type approved by the commissioner of safety.

(b) This section shall have no application to farm vehicles, or vehicles used by farmers to haul produce from farm to market, nor shall it apply to vehicles used exclusively for hauling logs.

(c) A violation of this section is a Class C misdemeanor.