Impairment basics — Oregon Permit Test

Impairment basics on the Oregon permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

If your blood alcohol concentration is 0.08% or more, Oregon law presumes you are impaired — but you can still be arrested even if your BAC is lower than 0.08%.

The number is a presumption, not a permission. Below it you are not safe from arrest, only from the presumption.

If your blood alcohol concentration is 0.08% or more, Oregon law presumes you are impaired, but you can still be arrested even if your BAC is lower than 0.08%.

2026-2027 Oregon Driver Manual, p.82

Oregon's DUII law applies to any substance that impairs your mental or physical ability to drive, including over-the-counter and prescription medications.

A lawful prescription is not a defense, which is why the manual says ask the pharmacist before driving on something new.

Oregon’s DUII law applies to any substance that impairs your mental or physical ability to drive.

2026-2027 Oregon Driver Manual, p.83

Alcohol is the most common drug involved when drivers are impaired, but marijuana impairment has also contributed to many collisions in Oregon, and using alcohol and marijuana together can reduce a person's ability to drive safely.

The combination is worse than either alone, which is the part drivers who have had a little of each get wrong.

The use of alcohol and marijuana together can reduce a person’s ability to drive safely.

2026-2027 Oregon Driver Manual, p.82

Oregon's open container law makes it illegal to have an open bottle or other container with alcohol in it while you are in a vehicle on any road; a container counts as open if its seal is broken, even if it has been reclosed, and any open containers should be in the trunk.

Reclosing the bottle does not reseal it, which is the misunderstanding the law names explicitly.

A container is considered to be open if its seal is broken, even if it has been reclosed.

2026-2027 Oregon Driver Manual, p.83

On the test

Can a driver be arrested for DUII in Oregon with a BAC below 0.08%?

Yes — arrest is possible below that figure. The number is a presumption, not a permission. Below it you are not safe from arrest, only from the presumption. 2026-2027 Oregon Driver Manual, p.82: “If your blood alcohol concentration is 0.08% or more, Oregon law presumes you are impaired, but you can still be arrested even if your BAC is lower than 0.08%.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

What it costs

  • One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
  • Free to start: a 10-question test and the first section of cards. No sign-up and no account.
  • Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
  • Every level up to Prepared — 3 tests passed in a row.
  • Do the work, fail the real exam, and we refund you.

All Oregon permit topics

Where these come from

Every rule here is checked against 2026-2027 Oregon Driver Manual, published by the Oregon Department of Transportation, and against the state code itself. Last checked 2026-09-15.