Vehicle noise (exhaust, muffler, modified-exhaust 'pops and bangs,' compression brakes on trucks, amplified car stereos audible from a distance) is regulated by California state law, not by a Rocklin-specific decibel chapter. Cal. Vehicle Code §27150 requires every motor vehicle to be equipped with an adequate muffler 'in constant operation' and prohibits muffler cutouts, bypasses, or similar devices. §27151 bans modifying an exhaust system to amplify noise. §27007 prohibits sound amplification from a vehicle audible at 50+ feet. Rocklin Police enforce these state-code sections; the state also sets passenger-vehicle limits at 95 dBA (CVC §27201) measured under SAE J1169 procedures.
California occupies the field of motor-vehicle equipment noise. Cal. Vehicle Code §27150(a): 'Every motor vehicle subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.' §27151(a): 'No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of the vehicle so that the vehicle is not in compliance with the provisions of Section 27150.' §27007: prohibits operating a vehicle sound system 'audible to a person whose normal hearing is unimpaired … at a distance of 50 or more feet from the vehicle' (with traffic-safety, emergency, and advertising-vehicle exceptions). §27201 sets the 95 dBA passenger-car limit measured under SAE J1169. §22952 governs commercial-vehicle engine-brake (Jake brake) use — local agencies may post 'No Engine Braking' signs but cannot otherwise vary state vehicle-noise law. Rocklin Police enforce these provisions through ordinary traffic stops; the state-required referee station program (Cal. Code Regs. tit. 13 §1106) can verify compliance after a citation.
CVC §27150/§27151 violations are correctable equipment infractions ('fix-it tickets'). CVC §27007 amplified-sound violation is an infraction (~$197 with assessments). CVC §27201 over-95-dBA violation is an infraction. Repeat or willful violations can escalate. Persistent vehicle-noise patterns (e.g., habitual sideshow / exhibition-of-speed) can also be charged under Cal. Vehicle Code §23109 (exhibition of speed).
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