North Dakota CDL — General Knowledge practice
North Dakota CDL — General Knowledge: Alcohol & Drugs practice test
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Content reviewed against official driver handbooks · August 12, 2026
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12 sample Alcohol & Drugs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. A CDL holder uses a personal car, not a CMV, in a felony involving the manufacture or distribution of a controlled substance. Under North Dakota's CDL rules, what follows?
Correct answer: A lifetime CMV disqualification, the same as if a CMV had been used
For this felony the rules make no distinction between vehicles: whether the holder was in a commercial or a noncommercial motor vehicle, the disqualification is for life.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, CDL Rules
2. Under North Dakota's implied consent rule for CMV operators, what does refusing an alcohol test bring?
Correct answer: License revocation for at least one year
By operating a CMV you are deemed to have consented to alcohol testing, and refusing the test means the license is revoked for no less than a year.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Implied Consent
3. Between which hours does the manual say many heavy motor vehicle accidents happen?
Correct answer: Midnight and 6 a.m.
Tired drivers fall asleep easily in the hours after midnight, especially those who do not normally drive then, so the manual advises scheduling trips for the hours you are usually awake.
Source: North Dakota Commercial Driver License Manual — Section 2.23.1, Be Ready to Drive
4. According to the manual, traffic crashes involving people who drink alcohol result in how many deaths each year?
Correct answer: More than 20,000
The manual calls drinking and driving a serious problem, tied to traffic crashes that kill over 20,000 people a year.
Source: North Dakota Commercial Driver License Manual — Section 2.22.1, Alcohol and Driving
5. North Dakota's list of requirements for earning a Class A, B, or C license includes a condition about alcohol and drugs. What is it?
Correct answer: The applicant cannot have an addiction to alcohol, narcotics, or any other drug
Along with reading, writing, and speaking English and passing the knowledge and road tests, an applicant must be free of addiction to alcohol or drugs.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Requirements Necessary to Earn a Class A, B, or C License
6. Beyond causing crashes, what does the manual say drug use can lead to for a driver?
Correct answer: Arrest, fines, jail sentences, and the end of a driving career
Using drugs can bring criminal penalties and can finish a person's time as a professional driver. The manual's safest rule is to keep drugs and driving entirely apart.
Source: North Dakota Commercial Driver License Manual — Section 2.22.2, Other Drugs
7. Which of these does the manual list as a reason to consult your physician or a sleep disorder center?
Correct answer: Snoring loudly and gasping or choking in your sleep
Frequent daytime sleepiness, trouble sleeping at night, loud snoring, gasping or choking during sleep, and waking up unrefreshed are all signs the manual says to take to a doctor or sleep center.
Source: North Dakota Commercial Driver License Manual — Section 2.23.1, Be Ready to Drive
8. On the road, you become so ill that you cannot drive safely. What does the manual allow in an emergency?
Correct answer: Continuing only as far as the closest spot where stopping is safe
A driver too sick to operate safely must not drive. The only exception is an emergency, when you may go as far as the first place you can stop safely.
Source: North Dakota Commercial Driver License Manual — Section 2.23.4, Illness
9. When planning breaks on a long drive, which one does the manual say to be sure to take?
Correct answer: A mid-afternoon break
Short breaks keep you alert, but they should come before you feel really tired. The manual advises a mid-afternoon break and planning your sleep for the hours from midnight to 6 a.m.
Source: North Dakota Commercial Driver License Manual — Section 2.23.2, While You Are Driving
10. How does a half-hour nap compare with a half-hour coffee stop for overcoming fatigue?
Correct answer: The nap does more
If you cannot stop for the night, pull off somewhere safe, a rest area or a truck stop for example, and nap. Even thirty minutes of sleep beats thirty minutes spent drinking coffee.
Source: North Dakota Commercial Driver License Manual — Section 2.23.3, When You Do Become Sleepy
11. How much alcohol does the manual say it can take for some people to show signs of impairment?
Correct answer: A single drink
Alcohol affects coordination, reactions, and vision, and for some people just one drink is enough to produce visible impairment.
Source: North Dakota Commercial Driver License Manual — Section 2.22.1, Alcohol and Driving
12. You feel the first signs of sleepiness and stop for the night earlier than planned. How does the manual suggest staying on schedule?
Correct answer: Get up a little earlier the next day
Stopping at the first signs of sleepiness, even ahead of plan, costs little: an earlier start the next morning keeps the schedule without the risk of driving when you are not alert.
Source: North Dakota Commercial Driver License Manual — Section 2.23.3, When You Do Become Sleepy
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Every North Dakota question is written from the official North Dakota driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free