Free Oregon DMV CDL — General Knowledge Practice Test 2026
The Oregon CDL — General Knowledge knowledge test has ~50 questions, and you need ~40 correct (80%) to pass. Practice free with questions written from the official Oregon driver handbook — every one has a clear explanation, and you can retake as often as you like with no sign-up.
Content reviewed against official driver handbooks · August 12, 2026
What's on the Oregon written test
The Oregon CDL — General Knowledge knowledge test has ~50 questions; you need ~40 correct (80%) to pass.
Based on the official Oregon exam format — always confirm current details with your state DMV.
Practice by topic
Focus on one area at a time — each topic has its own set of Oregon practice questions.
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
How to read traffic signals, lane lines, and pavement markings — including yellow and white lines, arrows, and flashing lights.
Who goes first at intersections, four-way stops, roundabouts, and crosswalks, and how to yield to pedestrians and emergency vehicles.
Following distance, scanning, blind spots, using your lights, and the habits that prevent crashes and keep you in control.
Driving safely around motorcycles, bicycles, large trucks, pedestrians, and school buses — and knowing who has the right of way.
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Legal and illegal parking, colored curbs, distances from hydrants and crossings, and how to park safely on hills.
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
What to do when things go wrong — brake failure, tire blowouts, skids, and stalling on railroad tracks.
The point system, license suspension, provisional-license rules, insurance requirements, and other licensing basics.
How to pass the first time
- Read the official Oregon driver handbook at least once before test day.
- Practice by topic to find your weak spots, then fix them.
- Take full-length practice tests until you pass comfortably every time.
- Read every explanation — understanding beats memorizing.
Oregon CDL — General Knowledge test — frequently asked questions
How many questions are on the Oregon CDL — General Knowledge test?
The Oregon CDL — General Knowledge knowledge test has ~50 questions, and you need ~40 correct (80%) to pass. Our practice tests mirror that format.
How many questions can I miss on the Oregon CDL — General Knowledge test?
You can miss up to ~10 of the ~50 questions and still pass — you need ~40 correct, which is 80%.
Can I retake the practice test?
Yes — practice as often as you like, completely free. The questions and answer choices are shuffled each time.
Can I take the Oregon practice test in Spanish?
Yes. Every question here is available in English and Spanish — switch languages anytime. Many states also offer the real knowledge test in languages other than English; confirm what Oregon offers with your DMV.
Can I practice on my phone?
Yes. The practice tests work in any mobile or desktop browser — no app or sign-up needed — so you can study anywhere.
Are these the real DMV test questions?
No. Our questions are original, written from the current official Oregon driver handbook to match the real test's topics and style. We are not affiliated with any DMV or government agency.
What's the best way to study?
Read the Oregon driver handbook, practice by topic to target weak areas, and finish with full-length tests until you consistently pass.
Other Oregon practice tests
Take the CDL — General Knowledge test in another state
Every Oregon question is written from the official Oregon 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
Oregon CDL — General Knowledge questions with answers
20 sample questions from the Oregon CDL — General Knowledge question bank — each with the correct answer, a short explanation, and the section of the official handbook it comes from.
Show all 20 questions with answers
1. At highway speed, roughly how far ahead is 12 to 15 seconds of travel?
Correct answer: About a quarter of a mile
At highway speeds, looking 12 to 15 seconds ahead is about a quarter of a mile.
Source: Oregon Commercial Driver Manual, Section 2.4.1 - Seeing Ahead
2. You have pulled off the road and stopped. Which lights should you turn on?
Correct answer: The four-way emergency flashers
Whenever you stop at the side of the road, switch on the four-way emergency flashers; this matters most at night. Don't count on your taillights alone to warn other drivers.
Source: Oregon Commercial Driver Manual, Section 2.5.2 - Communicating Your Presence
3. For how long can a Medical Examiner's Certificate (MEC) be valid?
Correct answer: No more than two years
A MEC can be valid for no more than two years.
Source: Oregon Commercial Driver Manual, Section i - Oregon Information
4. During a walk-around inspection, what color should the reflectors and marker lights be at the rear of the vehicle?
Correct answer: Red at the rear, amber toward the front
At the rear the reflectors and marker lights should be red; toward the front and along the sides they are amber.
Source: Oregon Commercial Driver Manual, Section 2.1.5 - Seven-step Inspection Method
5. Why should you avoid braking while making a quick emergency turn?
Correct answer: Braking while turning can lock the wheels and cause a skid
It is easy to lock your wheels while turning, and if that happens you may skid out of control.
Source: Oregon Commercial Driver Manual, Section 2.17.1 - Steering to Avoid a Crash
6. What can happen if you take a curve too fast in a heavy vehicle?
Correct answer: You may skid off the road or roll the vehicle over
If you take a curve too fast, the tires can lose traction and you skid off the road, or the vehicle can roll over.
Source: Oregon Commercial Driver Manual, Section 2.6.3 - Speed and Curves
7. What is the disqualification for a second conviction of using a hand-held phone while driving a CMV within three years?
Correct answer: 60 days
A second hand-held phone or texting conviction within three years brings a 60-day disqualification; three or more brings 120 days.
Source: Oregon Commercial Driver Manual, Section 2.9.4 - Cell/Mobile Phones
8. How can you help other drivers see you at dawn, dusk, or in rain or snow?
Correct answer: Turn on your low-beam headlights
Turn on your low-beam headlights, not just the identification or clearance lights, so others can see you.
Source: Oregon Commercial Driver Manual, Section 2.5.2 - Communicating Your Presence
9. Before starting across a road, what must you be sure of?
Correct answer: That you can clear the entire road before traffic arrives
Before crossing a road, make sure you can get all the way across before approaching traffic reaches you.
Source: Oregon Commercial Driver Manual, Section 2.7.7 - Space Needed to Cross or Enter Traffic
10. What is the only thing that will actually sober up a person who has been drinking?
Correct answer: Only letting time pass
The liver removes alcohol at a fixed rate, so only the passage of time will sober you up, not coffee or a cold shower.
Source: Oregon Commercial Driver Manual, Section 2.22.1 - Alcohol and Driving
11. What pavement markings warn of a railroad crossing on a two-lane road?
Correct answer: An X together with the letters RR painted on the pavement
The markings painted on the road are an X with the letters RR, along with a no-passing marking on two-lane roads.
Source: Oregon Commercial Driver Manual, Section 2.15.2 - Warning Signs and Devices
12. How do objects appear in a convex (fisheye) mirror compared to how they really are?
Correct answer: Smaller and farther away than they are
In a convex mirror everything looks smaller and appears farther away than it actually is.
Source: Oregon Commercial Driver Manual, Section 2.4.2 - Seeing to the Sides and Rear
13. After a tire has been changed, what should you do a short time later?
Correct answer: Stop soon and re-check the tightness of the nuts
After a tire has been changed, stop a short while later and re-check the tightness of the lug nuts.
Source: Oregon Commercial Driver Manual, Section 2.1.3 - What to Look For
14. In what language are Oregon commercial knowledge tests given?
Correct answer: English only, with no interpreters
Commercial knowledge tests are only available in English, and interpreters are not allowed.
Source: Oregon Commercial Driver Manual, Section i - Oregon Information
15. Where do you place warning devices when stopped on a one-way or divided highway?
Correct answer: At 10, 100, and 200 feet toward approaching traffic
On a one-way or divided highway, place the devices 10 feet, 100 feet, and 200 feet toward the approaching traffic.
Source: Oregon Commercial Driver Manual, Section 2.5.2 - Communicating Your Presence
16. If you must drive onto the shoulder to avoid a crash, when should you brake?
Correct answer: Wait until speed drops to about 20 mph, then brake gently
Avoid using the brakes until your speed has dropped to about 20 mph, then brake gently to avoid skidding on the loose surface.
Source: Oregon Commercial Driver Manual, Section 2.17.1 - Steering to Avoid a Crash
17. At what speed can hydroplaning begin when there is a lot of water on the road?
Correct answer: As low as 30 mph
Hydroplaning can occur at speeds as low as 30 mph when there is a lot of water on the road.
Source: Oregon Commercial Driver Manual, Section 2.6.2 - Matching Speed to the Road Surface
18. Under Oregon's Move Over Law, what must you do if you cannot safely change lanes for a vehicle with flashing lights?
Correct answer: Slow to at least 5 mph below the posted limit
If moving over is not possible, you must slow to at least 5 mph below the posted speed limit as you pass.
Source: Oregon Commercial Driver Manual, Section i - Move-Over Law
19. Why are drivers of delivery and step vans a special hazard?
Correct answer: They may suddenly step out or pull into traffic
Their vision is often blocked by packages, and they may suddenly step out or drive into the traffic lane.
Source: Oregon Commercial Driver Manual, Section 2.8.3 - Drivers Who Are Hazards
20. At a passive railroad crossing that has no traffic control device, who decides whether to stop or proceed?
Correct answer: The decision rests entirely with you
At a passive crossing there is no signal, so the decision to stop or proceed rests entirely with the driver.
Source: Oregon Commercial Driver Manual, Section 2.15.1 - Types of Crossings