Vehicle Noise: Redwood City vs San Mateo
How do vehicle noise rules compare between Redwood City, CA and San Mateo, CA?
Redwood City and San Mateo have similar restriction levels.
Redwood City, CA
San Mateo County
Noise from motor vehicles operated on public roads in unincorporated San Mateo County is primarily controlled by the California Vehicle Code, which requires an adequate muffler and prohibits modified exhaust that amplifies noise. The County's Chapter 4.88 noise limits generally address stationary, on-property noise rather than vehicles in transit on public rights-of-way.
View full Redwood City rules →San Mateo, CA
San Mateo County
Noise from motor vehicles operated on public roads in unincorporated San Mateo County is primarily controlled by the California Vehicle Code, which requires an adequate muffler and prohibits modified exhaust that amplifies noise. The County's Chapter 4.88 noise limits generally address stationary, on-property noise rather than vehicles in transit on public rights-of-way.
View full San Mateo rules →Key Facts Comparison
| Fact | Redwood City | San Mateo |
|---|---|---|
| Primary authority (roads) | California Vehicle Code | California Vehicle Code |
| Muffler requirement | Veh. Code 27150 | Veh. Code 27150 |
| Modified exhaust | Veh. Code 27151 | Veh. Code 27151 |
| Enforced by | Sheriff / CHP | Sheriff / CHP |
| On-property revving | County Code 4.88.350 | County Code 4.88.350 |
Highlighted rows indicate differences between cities.
Redwood City FAQ
Does the county have its own vehicle-noise decibel limit?
For vehicles on public roads, the California Vehicle Code controls. Sections 27150 and 27151 require an adequate muffler and prohibit modified exhaust that increases noise; these are enforced by the Sheriff and CHP.
What about a loud car idling or revving on a driveway?
Vehicle noise made on private property that disturbs neighbors can be addressed under the County's General Noise Regulation (4.88.350) in addition to any Vehicle Code violation.
San Mateo FAQ
Does the county have its own vehicle-noise decibel limit?
For vehicles on public roads, the California Vehicle Code controls. Sections 27150 and 27151 require an adequate muffler and prohibit modified exhaust that increases noise; these are enforced by the Sheriff and CHP.
What about a loud car idling or revving on a driveway?
Vehicle noise made on private property that disturbs neighbors can be addressed under the County's General Noise Regulation (4.88.350) in addition to any Vehicle Code violation.
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