Knox County code requires every motor vehicle to have a working muffler and bans muffler cutouts on county roadways. Excessive or unusual vehicle noise from a defective or modified exhaust is prohibited, mirroring Tennessee state law TCA 55-9-202.
Knox County Code section 62-263 ('Noise prevention') requires that every motor vehicle 'at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise,' and forbids using a muffler cutout or similar device on any county roadway. The provision tracks Tennessee state law (TCA 55-9-202). It is enforced by the Knox County Sheriff's Office as a traffic offense. This applies on roadways throughout the county; municipal traffic codes may add their own provisions inside city limits.
A misdemeanor traffic offense under Knox County Code 62-256/62-263; drivers may be cited for a defective or cutout exhaust.
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