CMC Sections 10.48.055-10.48.057 limit vehicle noise: engines may idle no more than three minutes per hour off the public right-of-way, and it is a violation to operate registered vehicles or off-road vehicles with faulty or modified exhaust producing excessive noise.
Cupertino Municipal Code Section 10.48.055 bars motor vehicles, including autos, trucks, motorcycles, scooters, and towed equipment, from idling in one location more than three minutes in any hour off the public right-of-way, unless the 10.48.040 limits are met or it is providing emergency services. Section 10.48.056 makes it a violation to operate a registered vehicle with a faulty, modified, or missing exhaust/muffler producing excessive noise as defined in California Vehicle Code Sections 27150-27151; the CHP Stationary Vehicle Test is prima facie evidence. Section 10.48.057 regulates off-road recreational vehicles under Vehicle Code Section 38365, barring units over 98 dBA at 20 inches or over 80 dBA at 50 feet. On-street moving-vehicle noise is enforced under the state Vehicle Code by police.
Vehicle-noise violations under Chapter 10.48 are misdemeanors punishable per CMC Chapter 1.12 (CMC 10.48.070). Exhaust/muffler violations also fall under California Vehicle Code Secs. 27150-27151 enforced by law enforcement.
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