California Vehicle Code §27007 prohibits operating any vehicle with modified or defective exhaust systems exceeding statutory decibel limits. SJMC Title 11 covers loading-zone hours and back-up alarms. Residential overnight delivery noise is also limited by SJMC 20.100 nighttime ambient standards of 50 dBA.
Truck noise on San Jose streets is governed primarily by California state law. Vehicle Code §27007 forbids operating any motor vehicle with a modified, defective, or amplified exhaust system, and §23130 sets statutory drive-by sound limits enforceable by SJPD. Diesel idling beyond five minutes is restricted by California Air Resources Board rule 13 CCR §2485 and SJMC Title 11. Loading-zone hours for commercial deliveries near residential zones often appear on posted signs limiting operations to 7 a.m. to 10 p.m. After 10 p.m., back-up alarms, refrigeration units, and pallet drops at supermarkets and warehouses must comply with SJMC 20.100 nighttime ambient limits of roughly 50 dBA at residential property lines, frequently triggering complaints around grocery and big-box retailers.
Modified or excessively loud exhausts draw a fix-it ticket plus fines under CVC §27007. Nighttime deliveries exceeding 50 dBA in residential areas cite the property owner under SJMC 20.100 with penalties up to $1,000 per night.
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