(A) Motor vehicle regulations. A person shall not:
(1) Equip, maintain, or operate a vehicle that creates or causes excessive or unusual noise;
(2) Operate any vehicle, except an electric vehicle without a spark arrestor device and a muffler or other effective noise suppressing system in good working order and in constant operation;
(3) Use a muffler cut-out, bypass, or similar device on a vehicle; or
(4) Use a compression brake system(s) except as necessary for an emergency stop.
(B) Certain noises prohibited on public rights-of-way during all hours. The following noise is declared to be excessive or unusual noise and expressly prohibited during all hours on county B roads and related public rights-of-ways in the unincorporated county.
(1) Horns and signaling devices on any vehicle, except as a danger warning signal as provided by the Utah Vehicle Code;
(2) Racing events unless such activity occurs during a permitted special event in the county;
(3) Revving, also known as rapid throttle advance, of an engine; and
(4) Any noise-creating device, including a vehicle, operated for the purpose of drawing attention to the source of the noise.
(C) Motorcycles.
(1) No person shall operate an on-highway motorcycle manufactured after December 31, 1985 not equipped with exhaust muffler bearing the federal EPA required labeling applicable to the motorcycle’s model year, stating that the exhaust system meets the 80 dBA standard at 50 feet, as set out in the Code of Federal Regulations Title 40, Volume 24, Part 205, Subpart D and Subpart E.
(2) No person shall operate an off-highway motorcycle manufactured after December 31, 1985 not equipped with exhaust muffler bearing the federal EPA required labeling applicable to the motorcycle’s model year, stating that the exhaust system meets the 82 dBA standard at 50 feet, as set out in the Code of Federal Regulations Title 40, Volume 24, Part 205, Subpart D and Subpart E.
(Ord. 2023-04, passed 12-5-2023)