Impaired Driving & Penalties — Missouri
Missouri CDL practice test: 413 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Impaired Driving & Penalties: 18 questions.
Blood alcohol limits, drugs and fatigue, licence suspensions, demerit points and fines.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Impaired Driving & Penalties |
| License test | Missouri CDL permit (CLP) knowledge tests |
| Topic questions | 18 (4% of 413 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
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Questions (18)
1. If feeling drowsy while driving, you should:
- Press on and finish the trip.
- Drive faster to reach your destination more quickly.
- Safely leave the road and take a nap. ✓
Answer: C. Safely leave the road and take a nap.
The correct move is to safely leave the road and take a nap. If you feel drowsy, the handbook's alertness guidance says to pull over and rest or nap. It also warns that trying to push on while tired is more dangerous than many drivers realize and is a major cause of fatal crashes. When fatigue signs appear, it tells you to stop and sleep for the night or take a short nap. That makes leaving the road safely the proper response.
2. One way to prevent fatigue on long trips is to:
- Take frequent breaks. ✓
- Text while driving.
- Drink caffeine.
Answer: A. Take frequent breaks.
Taking frequent breaks is the recommended way to prevent fatigue on long trips. The handbook lists reducing fatigue risk by taking periodic breaks, roughly every 100 miles or every 2 hours on a long trip. It also tells you to stop driving and rest or nap when you notice signs of tiredness. Caffeine gets its own warning: it may boost awareness for a few hours, but the effect wears off, so the handbook says not to count on it to prevent fatigue. Rest breaks are the method the handbook actually endorses.
3. Alcohol is removed from the body:
- By exercising.
- At a fixed rate. ✓
- More quickly if the person stays awake.
Answer: B. At a fixed rate.
Alcohol is removed from the body at a fixed rate. The handbook says the liver can process only one-third of an ounce of alcohol per hour, and it calls this a fixed rate. Because the body clears alcohol at that steady pace, drinking faster than the body can remove it leaves more alcohol in your system and affects driving more. The passage also says only time sobers you up, not black coffee or a cold shower. So the removal speed does not change with activity or staying awake.
4. When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
- Every three hours.
- Every day. ✓
- Every other week.
Answer: B. Every day.
5. Compared to talking on a cell phone while driving, texting while driving is:
- Much safer.
- Just as safe.
- More dangerous. ✓
Answer: C. More dangerous.
Texting while driving is more dangerous than talking on a cell phone. The handbook states that text messaging is even riskier than a phone conversation. It explains that texting pulls your eyes to a small screen and ties up your hands on the keypad, and it distracts you physically and mentally at the same time. That combination is why the handbook treats texting as the most alarming distraction. Talking on a phone can also distract you, but the passage puts texting in a higher-risk category, so the correct choice is the one saying it is more dangerous.
6. Alcohol can be removed from your system:
- By exercising.
- By drinking coffee.
- By waiting. ✓
Answer: C. By waiting.
Alcohol can be removed from your system only by waiting. The handbook explains that alcohol enters the bloodstream and is processed by the liver at a fixed rate. It says the liver handles only a small amount per hour, so the process cannot be rushed. The passage specifically says that time, not black coffee or a cold shower, will sober you up. That makes waiting the only listed way for alcohol to leave your system. The handbook does not mention exercise as a way to remove alcohol, and it directly rules out coffee as a sober-up method.
7. Alcohol begins to affect the body:
- After only one drink. ✓
- After several drinks have been consumed.
- At the legal limit.
Answer: A. After only one drink.
Alcohol begins to affect the body after only one drink. The handbook explains that alcohol enters the bloodstream and reaches the brain, and it lists mild effects such as a mellow feeling and slight body warmth among the early BAC effects. It also says the liver handles only about one drink per hour, so alcohol from a single drink is present and can affect you before it clears. The effects are tied to rising BAC, not to reaching the legal limit or to having several drinks first.
8. If feeling tired while driving, it is best to:
- Take a pep pill.
- Get some rest. ✓
- Continue driving.
Answer: B. Get some rest.
When you feel tired while driving, the best thing to do is get some rest. The handbook lists stopping driving to rest or nap as one of the ways to stay alert behind the wheel, and it warns that caffeine only helps for a few hours before wearing off, so you should not depend on it to prevent fatigue. Drugs may keep you awake but will not make you alert. The passage also points out that many drivers cannot tell when they are about to fall asleep, which is why the signs of fatigue should tell you to stop and rest.
9. Texting while driving should:
- Only be done on straightaways.
- Only be done in curves.
- Not be done. ✓
Answer: C. Not be done.
Texting while driving should not be done at all, so the choice that says it should not be done is correct. The handbook prohibits texting by commercial motor vehicle drivers, and it notes that carriers may not require or allow drivers to text. It also explains why: texting pulls your eyes off the road, the odds of a safety-critical event are far higher for drivers who text, and a text takes your eyes away for several seconds, long enough to cover a lot of ground without looking. The rules also carry disqualification and civil penalties, with a narrow exception for contacting law enforcement or emergency services.
10. Distracted driving:
- Can be avoided by eating while driving.
- Can be increased by pre-programming radio stations.
- Can be avoided by not engaging in complex conversations with others. ✓
Answer: C. Can be avoided by not engaging in complex conversations with others.
Distracted driving can be avoided by staying out of complex conversations with other people. The handbook advises drivers not to take part in complex or emotionally intense conversations with others in the vehicle. It places that advice in a list of steps for reducing distraction, together with setting up radio stations and route planning before driving and avoiding eating, drinking, and smoking at the wheel. The common thread is to keep driving from competing with a demanding side activity.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook