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Illinois Class D Written Exam Practice
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Safe & Responsible DrivingStandalone practice
For a driver age 21 or older operating an ordinary noncommercial car, at what BAC does the Illinois concentration-based DUI threshold begin?
Correct answer: 0.08%.
Why
The ordinary concentration-based DUI threshold begins at 0.08% BAC. A higher BAC also exceeds that threshold. Driving while impaired can support a DUI charge below 0.08%; that figure is not permission to drink and drive.
Verified against Illinois Rules of the Road, July2026 · Adult per-se BAC level · p. 51
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