2021 Tennessee Code
Part 4 - Lighting Regulations
§ 55-9-407. Multiple Beam Road Lighting Equipment — Use

Whenever the road lighting equipment on a motor vehicle is so arranged that the driver may select at will between two (2) or more distributions of light from headlights or lamps or auxiliary road lighting lamps or lights, or combinations thereof, directed to different elevations, the following requirements shall apply while driving during the times when lights are required: