BAC limit in a vehicle that needs a commercial license
A free practice question for the California permit test, with the answer explained.
Independent practice site. We're not the DMV and aren't connected to any government agency.
You are 30, and your vehicle needs a commercial license. What BAC is illegal for you?
The rule
In any vehicle that needs a commercial driver's license, driving with a BAC of 0.04% or more is illegal.
In any vehicle that requires a commercial driver's license, a BAC of 0.04% or more is illegal. That is half the 0.08% limit for adults in regular vehicles.
From the California Driver Handbook, section 9, page 73. This question is our own wording of that rule. The handbook and the DMV have the final word.
Often mixed up with
People confuse these rules with this one. Each has its own practice question.
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