What is the legal blood alcohol content (BAC) limit for driving?
Quick Answer
The legal BAC limit for adult drivers is 0.08% in all US states. For commercial drivers it is 0.04%. For drivers under 21, most states have a zero-tolerance policy — any detectable amount of alcohol (0.00%–0.02% depending on state) can result in a DUI charge.
Explanation
The legal BAC limit for adult drivers is 0.08% in all US states. For commercial drivers it is 0.04%. For drivers under 21, most states have a zero-tolerance policy — any detectable amount of alcohol (0.00%–0.02% depending on state) can result in a DUI charge. Understanding this concept is essential for safe driving and will help you answer similar questions on the DMV written test.
Why This Matters on the DMV Test
Questions about Safe Driving are among the most common on the permit test. Knowing the correct answer helps you pass your exam and stay safe on the road. Most states require a score of 70–83% to pass.
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