Impaired Driving & Penalties — Idaho
Idaho CDL practice test: 416 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 | Idaho CDL permit (CLP) knowledge tests |
| Topic questions | 18 (4% of 416 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
Not yet verified
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Questions (18)
1. Drowsy driving is most common during:
- The night. ✓
- The early morning.
- The mid-afternoon.
Answer: A. The night.
Drowsy driving is most common at night, so the correct choice is the one naming the night. The handbook says drowsy-driving crashes tend to happen when sleepiness is strongest, and it names the night and the mid-afternoon as those times. It then explains that most people are less alert at night, particularly after midnight, and that drivers who drive at night are much more likely to have fall-asleep crashes. That reasoning points to night as the time when drowsy driving is most common, which is what the question asks for.
2. 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.
3. If you are feeling tired and yawning a lot while you are driving, you should:
- Pull over and take a nap. ✓
- Get some coffee.
- Drive faster.
Answer: A. Pull over and take a nap.
You should pull over and take a nap. Yawning a lot is a sign of fatigue, and the handbook says to stop driving when you notice any sign of fatigue. It tells tired drivers to sleep for the night or take a short nap of about 15 to 20 minutes. The handbook also says forcing yourself to continue when tired is more dangerous than many people realize and is a major cause of deadly crashes. So the safe action is to get off the road and rest, not to keep driving.
4. 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.
5. Which of the following determines your blood alcohol concentration (BAC)?
- How much you drink ✓
- How frequently you drink
- The temperature of the drink
Answer: A. How much you drink
The amount you drink determines your blood alcohol concentration (BAC). Your blood alcohol concentration goes up with the amount of alcohol you drink. The handbook lists the amount consumed, how fast you drink, and your weight as the things that set BAC, with more alcohol producing a higher BAC. It also says the source of the alcohol does not matter, so whether it comes from beer, wine, or liquor, what counts is the alcohol itself. Nothing in the passages says the temperature of a drink changes BAC. That is why the amount you drink is the listed factor among these choices.
6. 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.
7. Texting while driving is especially dangerous because:
- It is both a mental and physical distraction. ✓
- A message may be upsetting to the driver.
- People like to read and may become too engaged in their phones.
Answer: A. It is both a mental and physical distraction.
Texting while driving is especially dangerous because it is both a mental and physical distraction. The handbook says texting makes you look at a small screen and work the keypad with your hands. That takes your eyes and hands away from driving, while your mind is also busy with the message. The handbook calls this a physical and mental distraction happening at the same time. It also says texting is riskier than talking on a cell phone for this reason. That combination is what makes texting especially dangerous, so the answer that names both kinds of distraction fits the handbook.
8. A second conviction of operating a CMV with a blood alcohol content (BAC) of 0.04 percent or more will result in:
- The loss of your CDL for one year.
- The loss of your CDL for five years.
- The loss of your CDL for life. ✓
Answer: C. The loss of your CDL for life.
9. Which of the following is not an example of a distracted person who should concern motorists?
- A driver talking to a passenger in their vehicle
- A person sitting on a bench waiting for a bus ✓
- A construction worker on the side of the road
Answer: B. A person sitting on a bench waiting for a bus
10. What eliminates alcohol from the bloodstream?
- Coffee
- Exercise
- Time ✓
Answer: C. Time
Time is what eliminates alcohol from the bloodstream. The handbook explains that alcohol goes into the bloodstream and the liver processes it at a fixed rate—only one-third of an ounce per hour, less than a standard drink. Because that rate cannot be sped up, the passage says only time, not black coffee or a cold shower, will sober you up. That directly supports choosing time as what eliminates alcohol from the bloodstream.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook