Unincorporated Weld County caps vehicle noise at 80-90 dB(A) by weight and speed zone and requires a working, unmodified muffler. Greeley bans loud tire-squealing, car stereos plainly audible at 50 feet, and engaged engine (Jake) brakes.
Weld County Code Sec. 14-9-40(D) limits vehicles over 10,000 lbs to 86 dB(A) in 35 mph-or-less zones and 90 dB(A) in faster zones; lighter vehicles to 80/84 dB(A), measured 25 feet away. Sec. 14-9-40(E) requires a constantly operating muffler and forbids cutoffs or bypasses. In Greeley, Sec. 12-329(b) bars a vehicle stereo plainly audible 50 feet away, Sec. 12-329(c) prohibits squealing tires, rapid acceleration and tire smoke, and Sec. 12-331 bans dynamic (compression) braking except to avoid imminent danger.
Weld vehicle-noise violations are Class II petty offenses ($30/$60/$300). Greeley Sec. 12-329 violations are misdemeanor infractions.
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