No Daly City-specific ordinance directly addresses vehicle noise; California Vehicle Code defaults apply, requiring adequate mufflers on all registered vehicles and prohibiting car sound systems audible 50 or more feet away on a highway.
Vehicle noise on public streets is regulated by state law rather than the Daly City Municipal Code. California Vehicle Code Section 27150 requires every registered motor vehicle with an internal combustion engine to be equipped at all times with an adequate muffler in constant operation, properly maintained to prevent excessive or unusual noise, and bans cutouts, bypasses, or similar devices. Vehicle Code Section 27007 prohibits a driver from operating a sound amplification system that can be heard outside the vehicle from 50 or more feet while on a highway, with exceptions for requesting assistance, warning of hazards, emergency and utility vehicles, and locally authorized parades or special events. Off the public roadway, loud car stereos on private property remain subject to Daly City's Chapter 9.22 disturbing-the-peace rules, including the 10:00 p.m.-6:00 a.m. quiet hours.
Muffler and loud-stereo violations are state Vehicle Code infractions cited by police during traffic stops; booming audio from a parked vehicle that is audible off-property at night can also be cited under Municipal Code Section 9.22.030.
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See how Daly City's vehicle noise rules stack up against other locations.
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