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NHTSA Module 9 Questions and Answers | Latest Version | 2025/2026 | Correct & Verified
What is one of the most common causes of impaired driving in the U.S.?✔✔Alcohol consumption
Explain how marijuana can impair a driver’s ability.✔✔Marijuana slows reaction time and affects coordination and decision-making.
What is the legal Blood Alcohol Concentration (BAC) limit for adult drivers in most states?
✔✔0.08%
Describe one short-term effect of alcohol on the brain.✔✔Alcohol affects judgment, making it harder to assess risk or react quickly.
Why is it dangerous to mix alcohol with prescription medication when driving?✔✔It can intensify drowsiness and slow the brain’s processing, increasing crash risk. 1 / 3
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What is one consequence of a first-time DUI offense?✔✔Loss of driving privileges and possible fines or jail time
Explain what a "designated driver" is.✔✔A designated driver is someone who agrees to stay sober and drive others home safely.
What is a field sobriety test used for?✔✔To determine if a driver is impaired based on physical and cognitive tasks.
Why can even a small amount of alcohol affect your driving ability?✔✔Because alcohol begins impairing the brain and body at very low levels.
What is zero tolerance in terms of underage drinking and driving?✔✔It means anyone under 21 cannot legally drive with any alcohol in their system.
What happens to your depth perception when you drive under the influence of drugs?✔✔It becomes impaired, making it difficult to judge distances accurately. 2 / 3
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Describe how fatigue and alcohol together affect a driver.✔✔Fatigue and alcohol amplify each other’s impairing effects, increasing crash risk.
What are ignition interlock devices used for?✔✔To prevent a driver from starting their car if they have alcohol in their system.
Why is refusal to take a breathalyzer test a legal issue in many states?✔✔Because of implied consent laws, refusal can result in license suspension.
What are the signs that a driver might be impaired?✔✔Swerving, slow reactions, erratic speed, and ignoring traffic signals
Explain how alcohol affects peripheral vision.✔✔Alcohol narrows peripheral vision, limiting awareness of surroundings.
Why is peer pressure a risk factor in impaired driving?✔✔It can lead people to make unsafe choices, like accepting a ride from a drunk driver.
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