61-9-321. Engine compression brake device -- use. (1) A commercial motor vehicle equipped with an engine compression brake device must be equipped with a muffler in good working condition to prevent excessive noise.
     (2) An operator of a commercial motor vehicle that has an engine compression brake device with a factory-installed muffler or an equivalent after-market muffler may not be prohibited from using the engine compression brake device.

     History: En. Sec. 1, Ch. 357, L. 2003; amd. Sec. 217, Ch. 542, L. 2005.