Under Vehicle Code §23152(d), a person driving a commercial motor vehicle is guilty of DUI at a BAC of:
Explanation
Vehicle Code §23152(d) sets a 0.04% BAC limit for any person driving a commercial motor vehicle (CDL required), matching federal Department of Transportation rules. The lower limit reflects the heightened public safety risk of large vehicles. Servers should treat patrons who mention they 'drive a truck for a living' or who arrive in a commercial vehicle with extra caution, especially when offering 'one for the road.'
Law Reference: Cal. Vehicle Code §23152(d)This topic, taught in full in the California RBS (Responsible Beverage Service) guide. California RBS — Responsible Beverage Service Study Guide (2026) — PDF + EPUB, $9.99 · 14-day refund →
Practice all 100 questions free — no signup required.
Own the complete California RBS (Responsible Beverage Service) guide — PDF + EPUB, $9.99 →
Related questions on this topic
- A patron tells the server, 'I can hold my liquor — five drinks doesn't even affect me.' What does high alcohol tolerance actually mean for the server's duty?
- A customer mentions they took a prescription pain medication or antihistamine earlier today. The most appropriate server response is to:
- Compared to a younger adult, an older adult (age 65+) of the same body weight will generally:
- Which cognitive or physical ability is impaired EARLIEST as BAC begins to rise, even at 0.02-0.04%?
- A 'blackout' from alcohol consumption refers to:
- A patron orders a 'double' 3-oz pour of 40% ABV bourbon. How many U.S. standard drinks does this contain?
Last reviewed: · editorial process