Tenn. Code Ann. § 55-8-167: Coasting prohibited - Penalties

(a) The driver of any motor vehicle, when traveling upon a down grade, shall not coast with the gears of the vehicle in neutral.

(b) The driver of a commercial motor vehicle, when traveling upon a down grade, shall not coast with the clutch disengaged.

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