BAC limit for drivers over 21
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 over 21 and driving your own car. At what BAC does driving become illegal?
The rule
Drivers over 21 break the law if their blood alcohol concentration (BAC) is 0.08% or more. Lower limits apply on DUI probation, in vehicles that need a commercial license, and when carrying paying passengers.
If you are over 21, driving with a BAC of 0.08% or more is illegal. Drivers under 21, on DUI probation, in commercial vehicles or with paying passengers have lower limits.
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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