Both Fort Collins (§ 20-28) and unincorporated Larimer County cap vehicle noise identically: heavy vehicles (10,000+ lb GVWR) at 86 dB(A) where posted 35 mph or less and 90 dB(A) above; lighter vehicles and motorcycles at 80 and 84 dB(A).
Fort Collins Municipal Code § 20-28 prohibits operating any motor vehicle or motorcycle on a public right-of-way so its sound exceeds set limits: vehicles with a manufacturer GVWR of 10,000 lb or more at 86 dB(A) (posted 35 mph or less) and 90 dB(A) (over 35 mph); all other vehicles and motorcycles at 80 and 84 dB(A). Off-road operation must meet § 20-23. Noise is measured at least 25 feet from the lane. Larimer County Ordinance 97-03 uses the same 86/90 and 80/84 dB(A) thresholds, measured at least 25 feet from the near side of the traveled way.
County: $30/$60/$300 escalating fines. Fort Collins: summons under § 20-29; loud modified exhausts and illegal mufflers are common triggers.
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