New York CDL — General Knowledge practice
New York 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
10 questions · pass with 8 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
10 sample Alcohol & Drugs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 10 questions with answers
1. What happens when a driver takes another drug and drinks alcohol at the same time?
Correct answer: The effects of the other drug can become much worse
Mixing the two amplifies the danger rather than balancing it out. The safe rule is to keep every drug, legal or not, away from driving altogether.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
2. Which driving error is typical of somebody who has been drinking?
Correct answer: Wandering across the lane lines and reacting late to hazards
Drink slows reaction time and ruins lane keeping. Weaving, jerky starts, running a red light, and driving far too fast or far too slow are all listed as effects of alcohol.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
3. Under 'implied consent' laws, by driving a commercial vehicle you have agreed to:
Correct answer: Submit to testing for alcohol or drugs when lawfully required
Implied consent means that by driving you have agreed to be tested for alcohol or drugs when lawfully requested. Refusing the test carries its own penalties, including disqualification of your CDL.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
4. Which statement about the alcohol content of common drinks is correct?
Correct answer: A 12-ounce beer, a 5-ounce glass of wine and a shot of 80-proof liquor carry about the same alcohol
It is the alcohol itself that impairs you, not the form it arrives in. A standard serving of beer, of wine, or of spirits delivers about the same dose, so switching drinks changes nothing.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
5. It is illegal to operate a commercial vehicle with a blood alcohol concentration (BAC) of:
Correct answer: 0.04% or higher
For commercial drivers, the legal limit is 0.04% BAC — half the 0.08% limit that applies to most car drivers. You can be convicted of driving under the influence at 0.04% or higher in a CMV.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
6. A person's blood alcohol concentration depends on which combination of factors?
Correct answer: How much you drank, how fast you drank it, and your body weight
More alcohol, taken faster, in a smaller person produces a higher reading. Nothing else you try — coffee, a cold shower, a big meal — changes that arithmetic.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
7. A roadside test finds some alcohol in a commercial driver's system, but the reading sits below the legal limit for a CMV. What happens next?
Correct answer: The driver is placed out of service for 24 hours
Any measurable alcohol ends the trip. Even under the commercial threshold, the driver is shut down for a full day before being allowed to operate again.
Source: New York CDL Manual — Disqualifications and Penalties
8. As blood alcohol climbs, which ability does alcohol interfere with first?
Correct answer: Judgment and self-control
The part of the brain governing judgment goes first, which is exactly why a drinker often cannot tell how impaired they have become. Vision, coordination and muscle control fall away as the level keeps rising.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
9. After drinking, the only thing that will lower your blood alcohol level is:
Correct answer: Time
Only time allows your body to remove alcohol. Coffee, food, exercise, or a cold shower may make you feel more awake but do not reduce your BAC or make you fit to drive.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
10. Prescription and over-the-counter medicines:
Correct answer: Can impair your driving and may make it unsafe to drive
Many legal drugs — including some cold, allergy, and pain medicines — can cause drowsiness or otherwise impair driving. Read labels, check with your doctor, and don't drive a CMV if a medication warns against operating machinery.
Source: New York CDL Manual — Alcohol, Other Drugs, and Driving
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Every New York question is written from the official New York 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