Tennessee Code Title 55. Motor and Other Vehicles § 55-7-115

(a) Except as provided in subsection (d), a single motor vehicle used exclusively to transport seed cotton modules shall not exceed a width of one hundred eight inches (108") when operated on any highway designated by the department of transportation, and shall not exceed a width of one hundred two inches (102") when operated on any highway not so designated.

(b) Except as provided in subsection (d), a single motor vehicle used exclusively to transport seed cotton modules may exceed the limitation on length provided for a single vehicle by § 55-7-201, but may not exceed a length of fifty-three feet (53').

(c) Except as provided by subsection (d), a single motor vehicle used exclusively to transport seed cotton modules may exceed the limitation on weight provided for a single vehicle, but the load on any one (1) axle may not exceed twenty thousand pounds (20,000 lbs.), the tandem axle load may not exceed thirty-eight thousand pounds (38,000 lbs.) without van-type cover, thirty-nine thousand four hundred pounds (39,400 lbs.) with van-type cover, and the overall gross weight of the vehicle or vehicles may not exceed fifty-nine thousand four hundred pounds (59,400 lbs.).

(d) A vehicle may not be operated on the national system of interstate and defense highways if it exceeds the maximum size or weight authorized by 23 U.S.C. § 127.