Oregon Alcohol & Drugs practice test

Key Oregon facts: Alcohol & Drugs

• At a blood alcohol concentration of 0.08% or higher Oregon presumes impairment, yet a driver below 0.08% can also be arrested for DUII. Safe & Responsible Driving, Impaired Driving, p. 82 (PDF p. 90)
• Alcohol is the most common drug in impaired driving, but marijuana impairment has contributed to many Oregon collisions, and using both together further reduces driving ability. Safe & Responsible Driving, Impaired Driving, p. 82 (PDF p. 90)
• Under Oregon's zero tolerance law, a driver under 21 fails the test with any amount of alcohol in the blood; a driver 21 or older fails at 0.08 percent or more. Safe & Responsible Driving, Impaired Driving, p. 83 (PDF p. 91)
• It is illegal to have an open container of alcohol in a vehicle on a road; a broken seal counts as open even if recapped, and open containers belong in the trunk. Safe & Responsible Driving, Impaired Driving, p. 83 (PDF p. 91)
• Refusing a breath test under the implied consent law leads to a one-year suspension, or three years if the driver has certain prior offenses. ORS 813.420(1)-(2)

Sample Alcohol & Drugs questions

After a DUII conviction, what minimum sentence must the court impose?

• 48 hours in jail or community service
• A $50 fine and nothing else
• At least 30 days in jail
• A warning letter from the court

Show the answer

48 hours in jail or community service

The court also requires a screening interview and treatment program.

Source: Oregon Revised Statutes 813.020, ORS 813.020(1)-(2)

A driver with no prior offenses refuses a breath test. How long is the suspension?

• 90 days
• One year
• Three years
• 30 days

Show the answer

One year

It is three years for drivers with certain prior offenses.

Source: Oregon Revised Statutes 813.420, ORS 813.420(1)-(2)

Besides a suspension, what presumptive fine does Oregon set for refusing a breath test?

• $2,000
• $265
• $650
• $100

Show the answer

$650

Refusal is a specific fine traffic violation.

Source: Oregon Revised Statutes 813.095, ORS 813.095(2)

May a passenger use marijuana in a private car on an Oregon highway?

• Yes, with windows open
• No
• Yes, if over 21
• Yes, if the driver does not

Show the answer

No

Consuming marijuana in a vehicle on a highway is a violation for drivers and passengers.

Source: Oregon Revised Statutes 811.482, ORS 811.482

Your BAC is 0.06% but your driving is impaired. Can you be arrested for DUII?

• Only if you crash
• No, you are under the limit
• Only if you are under 21
• Yes

Show the answer

Yes

Being under 0.08% does not protect you if you are impaired.

Source: Oregon Driver Manual 2026-2027, Safe & Responsible Driving, Impaired Driving, p. 82 (PDF p. 90); Oregon Revised Statutes 813.010, ORS 813.010(1); Oregon Revised Statutes 813.300, ORS 813.300(1)-(2)

After a first DUII conviction, how long must you use an ignition interlock device after the suspension ends?

• One year
• Five years
• 30 days
• Six months

Show the answer

One year

It is two years after a second or later conviction.

Source: Oregon Revised Statutes 813.602, ORS 813.602(1)(b)-(c)

A bottle's seal was broken and the cap put back on. Is it an open container?

• Only if half empty
• No, it is closed
• Only if a passenger has it
• Yes

Show the answer

Yes

A broken seal counts as open, even if the bottle was reclosed.

Source: Oregon Driver Manual 2026-2027, Safe & Responsible Driving, Impaired Driving, p. 83 (PDF p. 91); Oregon Revised Statutes 811.170, ORS 811.170(1)

How much alcohol in the blood does Oregon's zero tolerance law allow a 19-year-old driver to have?

• Up to 0.05%
• Up to 0.08%
• None
• Up to 0.02%

Show the answer

None

Under the zero tolerance rule, any alcohol at all means failing the test.

Source: Oregon Driver Manual 2026-2027, Safe & Responsible Driving, Impaired Driving, p. 83 (PDF p. 91); Oregon Revised Statutes 813.300, ORS 813.300(3)

What does the manual say about using alcohol and marijuana together?

• It is safe in small amounts
• The effects cancel out
• It can reduce your ability to drive safely
• It only affects passengers

Show the answer

It can reduce your ability to drive safely

Alcohol is the most common drug in impaired driving, and marijuana has contributed to many collisions.

Source: Oregon Driver Manual 2026-2027, Safe & Responsible Driving, Impaired Driving, p. 82 (PDF p. 90)

A driver with no prior offenses fails a breath test under the implied consent law. How long is the suspension?

• One year
• Three years
• 90 days
• 30 days

Show the answer

90 days

Drivers with certain prior offenses face one year.

Source: Oregon Revised Statutes 813.420, ORS 813.420(3)-(4)

Take this topic's test

More Oregon practice

• Full practice testAll topics, as in the knowledge test
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• EmergenciesBreakdowns, emergency vehicles and railroad crossings23 questions, 11 on Oregon rules
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• Insurance & CollisionsRequired coverage and what to do after a crash19 questions, 12 on Oregon rules
• Phones & DistractionPhone rules and other distractions13 questions, 11 on Oregon rules

About these questions

We wrote these practice questions from the facts in the Oregon Driver Manual (2026-2027 edition, Form 735-37 (1-26), read 2026-11-09; the PDF linked from the DMV manuals page is byte-identical (SHA-256) to the copy read, and the online manual (oregon.gov/odot/dmv/pages/online_manual) has the same text. Pages are cited as printed with the PDF page (PDF page = printed page + 8); PDF pages 56 and 57 both carry the School Zones text (printed 48 and 49), and the Impaired Driving text is printed twice (pp. 82-83), so citations use p. 49 and pp. 82-83. The manual says it condenses and paraphrases selected language of the Oregon Revised Statutes and is not a source of law (p. iv), so rules of law were checked against the ORS 2025 edition on oregonlegislature.gov (chapters 153, 742, 806, 807, 809, 811, 813, 815; read 2026-11-09), and teen licensing restrictions against ORS 807.122 and DMV's teen pages. Conflicts and gaps: approaching a stopped vehicle (p. 57) says you must change lanes and 'may also' slow down; ORS 811.147 requires a lane change away from the vehicle or slowing to at least 5 mph under the limit on multilane roads, and slowing on two-lane roads, so questions follow the statute. The uncontrolled intersection rule (p. 42) is backed by ORS 811.275, which gives the driver on the right the right of way regardless of who arrives first. Not used: towing fines (p. 36, no statute found in this round), the disabled parking fine range $165-$1,000 (p. 70; ORS 811.615 sets Class C and Class A violations, no such range), the 50-foot loud sound rule (p. 80; ORS 815.232 limits it to vehicles inside an urban growth boundary) and the stopping-distance chart (image only). ORS 811.145 and 811.507 change on 2027-01-01 (Oregon Laws 2025, chapter 278) only by adding organ transport vehicles, which no question uses. edition) and from official sources on road signs. Every answer links to its source, so you can check it and read more.

DMV Decoded is an independent guide, not a government agency. This practice test is not connected to the Oregon Department of Transportation, Driver and Motor Vehicle Services (DMV), and your actual test will have different questions. Study the handbook, and check the agency's website for current rules.