On-road motor-vehicle exhaust and engine noise is primarily a matter of California Vehicle Code, not the Chino Municipal Code. Vehicle Code §27150 requires every motor vehicle to have an adequate muffler in constant operation, with no cutout, bypass, or similar device. §27151 prohibits modifying an exhaust system to amplify or increase noise; for passenger vehicles under 6,000 lb GVWR (other than motorcycles), an exhaust sound level over 95 dBA (measured per SAE J1492 / J1169) is a violation. CHP and Chino Police enforce these under state law. Article 2.5 (Veh. Code §§27200–27207) sets vehicle-class noise limits (e.g., motorcycles: 80 dBA at 50 ft for post-1985 models). Loud cars off public roadways, or stationary vehicle noise (revving in a driveway, idling refrigerated trucks), fall under Chino CMC §9.40 exterior noise standards (65 dBA day / 55 dBA night at residential property line). Cal. Vehicle Code §21461 preempts cities from regulating equipment on vehicles operated on public highways beyond what state law allows.
Common Chino enforcement scenarios: (1) Modified-exhaust motorcycles or tuner cars cruising Central Ave or near the Auto Center — CHP / Chino PD ticket under VC §27150/27151 ($25 base fix-it ticket, potential proof-of-correction required; $193 secondary fine if uncorrected). (2) Idling diesel trucks at warehouses (Mountain Ave / Edison Ave logistics corridor) — CARB anti-idling rule (13 CCR §2485, 5-minute limit) plus Chino CMC §9.40 exterior standard at the nearest residential property line. (3) Equestrian-zone trail vehicles and ATVs operating off public roads are not Vehicle Code regulated for noise; they fall under CMC §9.40 if disturbing neighbors. (4) Train horn noise (BNSF San Bernardino Subdivision through southern Chino) is federally preempted by 49 CFR §222; quiet-zone designation requires city action with FRA.
Vehicle Code §27150/§27151 violation: correctable 'fix-it' citation requiring muffler restoration and proof of correction; uncorrected becomes a standard infraction with bail schedule (~$193–$238 in San Bernardino County). Idling: CARB §2485 violation up to $300 per occurrence. Stationary off-road vehicle noise under CMC §9.40: $100 first / $200 second / $500 third administrative citation within 12 months.
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