Tennessee Code Title 55. Motor and Other Vehicles § 55-9-103

(A) One (1) in the center of the line of traffic occupied by the disabled motor vehicle not less than forty (40) paces or approximately one hundred feet (100′) distant therefrom in the direction of traffic approaching in that line;

(B) One (1) not less than forty (40) paces, or approximately one hundred feet (100′) from the vehicle in the opposite direction;

(C) One (1) at the traffic side of the vehicle approximately ten feet (10′) rearward or forward thereof;

(D) If the motor vehicle is disabled within three hundred feet (300′) of a curve, crest of a hill or other obstruction to view, the flare in that direction shall be so placed as to afford ample warning to other users of the highway, but in no case less than forty (40) paces, approximately one hundred feet (100′) nor more than one hundred twenty (120) paces, approximately three hundred feet (300′), from the disabled vehicle;

(E) Care should be taken in placing any flare, fusee, or any signal produced by a flame to prevent igniting any gasoline or other inflammable liquid or gas; and

(F) As to every motor vehicle used for the transportation of inflammable liquids or inflammable compressed gas in cargo tanks, whether loaded or empty, the use of flares, pot torches, fusees or any signal produced by a flame is prohibited, and lighted red electric lanterns or red emergency reflectors shall be used in lieu thereof. Every motor vehicle, whether required to carry red electric lanterns or red emergency reflectors or not, may carry the red electric lanterns or red emergency reflectors in lieu of flares, pot torches and fusees. The placement of the red electric lanterns or red emergency reflectors in the event of disablement shall be the same as the requirements for the placing of pot torches, fusees or flares; and