Oregon: Alcohol and drugs Practice Test
How alcohol, marijuana and other drugs affect driving, the 0.08% BAC presumption, DUII and implied consent.
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Questions are original and based on the official manual "Oregon Driver Manual" (2026-2027), Oregon Driver and Motor Vehicle Services (DMV).
All 15 questions in this practice test
Take the test above first, then use this list to study. Tap “Show answer” to see the correct answer and explanation.
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What does the manual say to do if you have used drugs of any kind?
- Drive only on roads you know well
- Leave the driving to someone else
- Wait a short while, then drive normally
- Drive slowly in the right lane
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Correct answer: Leave the driving to someone else
The manual says to leave the driving to someone else if you have used drugs of any kind.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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If you drive while alcohol or drugs are affecting you, you could be arrested for
- reckless parking
- careless merging
- DUII
- failure to signal
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Correct answer: DUII
Driving while alcohol or drugs are affecting you can lead to an arrest for DUII.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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At what blood alcohol concentration does Oregon law presume you are impaired?
- 0.08% or more
- 0.04% or more
- 0.05% or more
- 0.10% or more
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Correct answer: 0.08% or more
If your BAC is 0.08% or more, Oregon law presumes you are impaired.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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Can you be arrested for DUII if your BAC is lower than 0.08%?
- No, an arrest requires 0.08% or more
- Yes, you can still be arrested
- Only if you have caused a collision
- Only if you refuse a breath test
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Correct answer: Yes, you can still be arrested
You can still be arrested even if your BAC is lower than 0.08%.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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Which drug is the most common one involved when drivers are impaired?
- Marijuana
- Prescription medication
- Over-the-counter medication
- Alcohol
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Correct answer: Alcohol
Alcohol is the most common drug involved when drivers are impaired.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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What can using alcohol and marijuana together do?
- Reduce a person’s ability to drive safely
- Cancel out each other’s effects
- Make you more alert on the road
- Have no effect if taken hours apart
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Correct answer: Reduce a person’s ability to drive safely
The use of alcohol and marijuana together can reduce a person’s ability to drive safely.
Source: Oregon Driver Manual (2026-2027), page 82 · Open this page in the manual (Manual page 82)
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If you are not sure it is safe to drive after taking a new medication, what is best?
- Drive only short distances
- Take half the usual dose
- Find different transportation
- Drive with a passenger beside you
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Correct answer: Find different transportation
The manual says it is best to find different transportation if you are not sure it is safe to drive after a new medication.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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Whom does the manual say to ask about the side effects of any medication?
- A police officer or traffic judge
- An insurance agent or DMV clerk
- Your doctor or pharmacist
- A driving instructor or friend
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Correct answer: Your doctor or pharmacist
The manual says to ask your doctor or pharmacist about the side effects of any medication.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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The DUII law in Oregon applies to which substances?
- Any substance that impairs your ability to drive
- Only alcohol and illegal drugs, not medications
- Only drugs that are not prescribed by a doctor
- Only substances that cause a loss of consciousness
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Correct answer: Any substance that impairs your ability to drive
Oregon’s DUII law applies to any substance that impairs your mental or physical ability to drive, including medications.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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Under Oregon’s Implied Consent law, by driving a motor vehicle you have agreed to
- let an officer search your vehicle at any time
- complete a safety course if you are stopped
- surrender your license if an officer asks for it
- take a breath, blood, or urine test when asked
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Correct answer: take a breath, blood, or urine test when asked
By driving a motor vehicle you have agreed to take a breath, blood, or urine test when asked by a police officer.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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What may happen if you refuse to take a test under Oregon’s Implied Consent law?
- You will automatically be charged with a felony
- You may be fined or lose your driving privileges
- You will only receive a written warning
- You must retake the written knowledge test
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Correct answer: You may be fined or lose your driving privileges
If you refuse a test, you may receive a fine, and/or your driving privileges could be suspended.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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If you are under 21, you will fail the alcohol test if you have a blood alcohol concentration of
- any amount
- 0.02% or more
- 0.05% or more
- 0.08% or more
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Correct answer: any amount
Oregon has a zero tolerance law: under 21, any amount of blood alcohol fails the test.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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What does Oregon’s Open Container law make it illegal to have in a vehicle on any road?
- Any sealed bottle of alcohol
- An empty bottle that once held alcohol
- An open bottle or container with alcohol in it
- A bottle of alcohol that is in the trunk
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Correct answer: An open bottle or container with alcohol in it
It is illegal to have an open bottle or other container with alcohol in it while you are in a vehicle on any road.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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When is an alcohol container considered open under the Open Container law?
- Only if some of the alcohol has been poured out
- If its seal is broken, even if it has been reclosed
- Only if the cap has been removed
- Only if the driver has been drinking
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Correct answer: If its seal is broken, even if it has been reclosed
A container is considered open if its seal is broken, even if it has been reclosed.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)
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Where should any open bottles or containers of alcohol be kept in a vehicle?
- Under the front seat
- In the glove compartment
- On the back seat
- In the trunk
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Correct answer: In the trunk
The manual says any open bottles or containers should be in the trunk.
Source: Oregon Driver Manual (2026-2027), page 83 · Open this page in the manual (Manual page 83)