Logan, UT Noise Ordinances: Vehicle Noise (2026)

Section 8.16.710 of the Logan Municipal Code has two commands. No person can operate a motor vehicle or motorcycle that lacks a muffler or other sound dissipative device in good working order and in constant operation. No person can remove or render inoperative any muffler or sound dissipative device, other than for maintenance, repair or replacement. Section 10.56.080 backs this up by forbidding anyone to sell, furnish, provide or purchase, or attach to a vehicle, any device that will or is intended to increase the sound of the original muffling equipment.

Numeric limits come from Table II in § 8.16.700, measured at fifty feet on a public right of way. A motor carrier vehicle in interstate commerce of 10,000 pounds GVWR or GCWR or more, and any other vehicle of 6,000 pounds or more, is limited to 88 dBA at 35 mph or less, 90 dBA over 35 mph and 88 dBA stationary run up. A motorcycle is limited to 86, 90 and 86 dBA in those columns. Any other motor vehicle or combination towed by one is limited to 76, 83 and 76 dBA. Recreational vehicles off public rights of way, including snowmobiles and motorcycles, face a 73 dBA limit at fifty feet under § 8.16.730.

Other provisions cover specific vehicle noises. Under § 10.52.270(A), a stopped, standing or parked vehicle must keep the noise of its motor and muffler below eighty five (85) decibels at fifty feet, and § 10.52.270(B) bars idling for more than two minutes while stationary except below zero degrees Fahrenheit, with exceptions for on duty police officers, firefighters and city vehicles operating equipment. Section 8.16.740 bars engaging a dynamic braking device where an official traffic control device prohibits it. Section 8.16.720 limits horn use on public right of way or public space to warning of danger. A vehicle stereo falls under § 8.16.412, which tests the sound at fifty feet from a device operated in or on a motor vehicle.