Tennessee Code Title 55. Motor and Other Vehicles § 55-7-103

(a) From January 15 to April 15 of each year, and at any other time when, by reason of repairs, weather conditions, or recent construction of the road, the maximum weight permitted would damage the road, the department of transportation may specify any lower maximum weight that, in the discretion of the department, is necessary in order to protect the streets, roads, highways, or other public thoroughfares from unnecessary injury or damage.

(b) Notice of a reduction in weight of load shall be given by the department by posters posted at the termini of the road and all detours for one (1) week before the reduction of load becomes effective.