Vehicle Noise: Brentwood vs Martinez
How do vehicle noise rules compare between Brentwood, CA and Martinez, CA?
Brentwood and Martinez have similar restriction levels.
Brentwood, CA
Contra Costa County
Vehicle noise in Brentwood is regulated primarily through California Vehicle Code §27150 (adequate muffler) and §23130 (decibel limits), enforced by Brentwood Police. Modified exhaust, engine revving, and audio systems audible at 50 feet can result in citations and fix-it tickets.
View full Brentwood rules →Martinez, CA
Contra Costa County
Vehicle noise in Martinez is regulated through California Vehicle Code sections enforced by Martinez Police, including prohibitions on modified exhaust systems, excessive engine revving, loud stereos audible from 50+ feet, and sustained horn use. Fines typically range from $200 to $500, with equipment violations requiring proof of correction through a certified referee inspection.
View full Martinez rules →Key Facts Comparison
| Fact | Brentwood | Martinez |
|---|---|---|
| Muffler requirement | CVC §27150 | - |
| Motorcycle limit | 95 dBA (CVC §23130) | - |
| Car limit | 80-86 dBA | - |
| Audio system | Audible at 50 ft = violation | - |
| Typical penalty | Fix-it ticket + $25 fee | - |
| - | - |
Highlighted rows indicate differences between cities.
Brentwood FAQ
Is aftermarket exhaust legal in Brentwood?
Only if it complies with CVC §27150 (adequate muffler, no cutouts/bypasses) and keeps total vehicle noise under the CVC §23130 limits. Straight-pipe and whistle-tip setups are not legal on public streets.
Can I be cited for loud bass from my car stereo?
Yes. CVC §27007 makes it an infraction to operate a sound amplification system that is audible at a distance of 50 feet or more from the vehicle.
Martinez FAQ
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