LNMC Section 11-8-48 addresses creating a disturbance by vehicle, and Section 6-6-8.1 bans motor-vehicle racing, testing, or timing between 11:30 p.m. and 8 a.m. State Vehicle Code governs muffler and exhaust noise on public roads.
Vehicle noise is split between local and state rules. LNMC Section 6-6-8.1 makes it unlawful to conduct motor-vehicle racing, testing, timing, or similar noise-producing activity - including race cars, drag cars, motorcycles, and off-road vehicles - between 11:30 p.m. and 8 a.m. The noise code cross-references Section 11-8-48 (creating a disturbance by vehicle). Ordinary exhaust, muffler, and modified-vehicle noise on public streets is largely preempted by the California Vehicle Code (e.g., Sections 27150-27151 on adequate mufflers), which the noise ordinance defers to under the state/federal preemption exemption in Section 6-6-7(10). Stationary vehicle noise on residential property (idling, sound systems) can still be measured against the Section 6-6-5 standards.
Racing/testing between 11:30 p.m. and 8 a.m. violates LNMC Section 6-6-8.1 (misdemeanor). On-road muffler/exhaust noise is enforced by police under California Vehicle Code Sections 27150-27151.
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