Vehicle noise in Santa Cruz is regulated by California Vehicle Code §27150–27151 (muffler and modification rules) plus local §10.40.270, which limits engine idling on city streets to 90 consecutive seconds.
CVC §27150 requires every motor vehicle to have an adequate muffler in constant operation to prevent excessive or unusual noise; §27151 prohibits exhaust modifications that amplify noise. Santa Cruz Police enforce CVC standards through fix-it tickets and CHP referee referral. Locally, §10.40.270 makes it unlawful to idle a truck, automobile, or motorcycle engine longer than 90 seconds while parked on a city street, with exceptions for emergency vehicles, defrosting windows, and work-related uses (lifts, winches, cranes).
Idling beyond 90 seconds is a citable offense. CVC exhaust violations are equipment ('fix-it') tickets that escalate if uncorrected.
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