California Code of Regulations Title 13 §2485 caps heavy-duty diesel idling at five minutes statewide, enforced across Santa Clara County by CARB and the Bay Area Air Quality Management District. The county fleet idle-reduction policy mirrors the limit for county-owned trucks and buses.
13 CCR §2485 prohibits diesel-fueled commercial vehicles over 10,000 pounds from idling more than five minutes anywhere in California. Section 2480 forbids school buses from idling within 100 feet of schools or while loading. The Bay Area Air Quality Management District (BAAQMD) enforces parallel limits across all nine Bay Area counties including Santa Clara. The county Roads and Airports Department adopted a fleet idle-reduction policy mirroring those standards for county-operated vehicles. CARB and BAAQMD inspectors lead enforcement against private operators in unincorporated areas, with the Sheriff supporting at warehouses, transfer stations, and freight hubs near San Jose Mineta Airport, the Port of Oakland feeder routes, and along US-101.
CARB issues civil penalties starting at $300 and rising to $1,000 per day per vehicle. BAAQMD adds penalties under its diesel idling rule reaching $10,000 for repeat industrial violators. Habitual operators face Notice of Violation hearings before the Hearing Board.
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See how Santa Clara County's vehicle idling restrictions rules stack up against other locations.
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