New Hampshire Driver's Education Practice Exam

What is the legal BAC limit for a driver age 21 or older to be convicted of a DWI?

0.08 0.04 0.02 0.10

Correct Answer:

0.08

Explanation:

For drivers 21 and older, the law uses a per se limit: a blood alcohol content of 0.08 percent or higher means you’re legally considered intoxicated to drive. That threshold is chosen because at about 0.08% most people experience significant impairment to coordination, judgment, and reaction time, making driving unsafe. Other numbers exist for different situations—0.04% is a stricter limit for commercial drivers, and 0.02% is often the under-21 limit—so while impairment can occur below 0.08, the 0.08% level is the standard for a DWI conviction for adults.

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