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South Dakota Operator License Knowledge Practice Test
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Safe & Responsible DrivingStandalone practice
Your friend had one drink with dinner and says, "I am under the legal limit, so my driving is not affected." What does the South Dakota manual say about this?
Correct answer: Impairment starts with the first drink, and vision is affected at 0.02 percent.
Why
Many people who drink show no outward signs, but their crash risk still rises as the alcohol level goes up. Vision is the most important sense for driving, and alcohol blurs it and makes distance and speed harder to judge. The safe choice is not to drive after any drink and not to let a friend drive after drinking.
Verified against South Dakota Driver License Manual · Effects of alcohol and other impairing drugs · p. 20, 21
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