Free Oregon CDL Practice Tests 2026

• Test Format: Computer-based at Oregon DMV offices
• General Knowledge Test: 50 questions, need 80% to pass
• CLP Validity: 12 months
• Required Wait Time: Must hold CLP for at least 14 days before skills test
• Languages: English only
• Fees: Class A or B original CDL $78.50, Class C original CDL $75.50
• Endorsement Fees: $4.00 per endorsement
• Retesting: Can retest as soon as the next day after failure
• Entry Level Driver Training (ELDT): Required for new CDL applicants after February 7, 2022

The Oregon CDL knowledge test is a test of your knowledge of commercial driving rules and safety practices. You must pass this test to get a Commercial Learner Permit (CLP) which is required before taking the skills test for a full CDL. The test covers vehicle operation, safety protocols, traffic regulations and proper operating procedures. It's taken electronically at DMV offices throughout Oregon and includes questions on federal regulations and Oregon specific rules so you have the knowledge to operate commercial vehicles safely in Oregon and across state lines if applicable.

You need to take the CDL knowledge test if you're:

• Getting your first Commercial Learner Permit (CLP)
• Adding a new endorsement to your existing CDL
• Upgrading your CDL class (such as from Class B to Class A)
• Reinstating a CDL that has been expired for more than one year
• Transferring a CDL from another state and adding new endorsements

All applicants must take the general knowledge test. Depending on the commercial vehicle you plan to drive you'll need additional tests for specific endorsements like Passenger (P), School Bus (S), Tank Vehicles (N), Hazardous Materials (H) or Doubles/Triples (T).

The CDL knowledge test ensures you understand the regulations and have the knowledge to operate commercial vehicles safely. It verifies your knowledge of safety protocols, technical information and emergency procedures. Because of their size and weight commercial vehicles can cause a lot of damage in an accident so proper knowledge and training is essential before operation. The knowledge test is the first step in showing you're ready for commercial driving responsibilities.

Oregon's CDL knowledge test matches Federal Motor Carrier Safety Administration standards while incorporating Oregon specific regulations. This ensures nationwide consistency in commercial driver qualifications while addressing state specific requirements. The test covers general driving skills, air brake operations, combination vehicles and specific endorsements. This standardization means your Oregon CDL will be recognized throughout the United States so you can operate commercial vehicles across state lines when you meet age and other requirements for interstate commerce.

Oregon's CDL knowledge tests have a specific number of questions based on the test type:

• General Knowledge: 50 questions
• Air Brakes: 25 questions
• Combination Vehicles: 20 questions
• Passenger Endorsement: 20 questions
• School Bus Endorsement: 20 questions
• Hazmat Endorsement: 30 questions
• Tank Vehicles Endorsement: 20 questions
• Doubles/Triples Endorsement: 20 questions

All questions are multiple-choice with four possible answers. These comprehensive tests cover safety procedures, regulations and technical aspects of commercial vehicle operation.

Sample question: When checking your tires before a trip, what is the minimum tread depth for front tires?

• 2/32 of an inch
• 4/32 of an inch
• 6/32 of an inch
• 8/32 of an inch

Answer: B. 4/32 of an inch

In Oregon you need to answer 80% of questions correctly on each test:

• General Knowledge: 40 out of 50 questions
• Air Brakes: 20 out of 25 questions
• Combination Vehicles: 16 out of 20 questions
• Passenger Endorsement: 16 out of 20 questions
• School Bus Endorsement: 16 out of 20 questions
• Hazmat Endorsement: 24 out of 30 questions
• Tank Vehicles Endorsement: 16 out of 20 questions
• Doubles/Triples Endorsement: 16 out of 20 questions

Each test is scored separately and you must pass each one individually. If you fail one test but pass others you'll only need to retest the failed test.

In Oregon the CDL knowledge test is only offered in English. Federal regulations require commercial drivers to read and speak English sufficiently to understand traffic signs, communicate with officials, complete records and understand shipping documents. This requirement ensures all commercial drivers can navigate roadways safely, communicate effectively with law enforcement and emergency services and properly handle documentation. There are no exceptions to this language requirement for CDL testing in Oregon.

No study aids are allowed during Oregon CDL knowledge tests. You cannot use notes, electronic devices, reference materials or calculators. Testing areas are monitored and using prohibited materials will result in test failure. All personal items must be stored in designated areas during testing including:

• Cell phones and electronic devices
• Notes or reference materials
• CDL manuals
• Calculators (unless specifically authorized for certain questions)

Using prohibited materials during testing may result in disqualification and could affect your ability to test again in the future.

Oregon DMV does not have time limits for CDL knowledge tests. Most applicants complete the general knowledge test in 60-90 minutes and endorsement tests in 30-45 minutes. Plan accordingly if taking multiple tests in one visit. The DMV provides enough time to complete the tests without rushing. If you have documented learning disabilities or other special needs accommodations may be available with proper documentation.

Oregon offers several CDL knowledge tests depending on the class of license and endorsements you need:

• General Knowledge – Must-pass test for all CDL types.
• Air Brakes – Required for using air brake systems.
• Combination Vehicles – Needed for Class A license holders.
• Passenger (P) Endorsement – Allows transport of passengers.
• School Bus (S) Endorsement – Required to operate a school bus.
• Doubles/Triples (T) Endorsement – For multiple trailer vehicles.
• Tank Vehicles (N) Endorsement – Needed for hauling fluids or gases.
• Hazardous Materials (H) Endorsement – Required for hazmat transportation.

Each test covers specific knowledge relevant to that class of vehicle or type of operation. You only need to take the tests that apply to the type of commercial driving you plan to do.

Sample question: When driving with air brakes in Oregon's mountainous terrain, which of these is NOT a proper braking technique?

• Apply brakes intermittently
• Downshift before starting downhill
• Rely primarily on the service brake for long downgrades
• Use engine braking when available

Answer: C. Rely primarily on the service brake for long downgrades

General Knowledge: Vehicle inspection, basic control, shifting, space management, night driving, weather conditions, emergency procedures, cargo handling, accident procedures, fires, fatigue awareness, and basic hazardous materials information.

Air Brakes: System components, dual air systems, inspection procedures, usage in various conditions, emergency stops, system failures, and brake lag/fade.

Combination Vehicles: Coupling/uncoupling procedures, inspection points, handling characteristics, rollover prevention, jackknife avoidance, turning techniques, and backing procedures.

Passenger (P): Loading/unloading procedures, emergency exits, passenger communication, accessibility, managing disruptive passengers, and railroad crossing requirements.

School Bus (S): Student loading/unloading, emergency evacuation, operating near schools, railroad crossings, student management, danger zones, and special equipment.

Doubles/Triples (T): Coupling/uncoupling multiple trailers, handling characteristics, inspection procedures, correcting handling problems, and operating in difficult conditions.

Tank Vehicle (N): Liquid surge effects, baffled versus non-baffled tanks, loading/unloading procedures, and braking with partially full tanks.

Hazmat (H): Classification of materials, documentation, loading/unloading procedures, driving rules, emergency response, and security awareness.

Effective study strategies for the Oregon CDL knowledge test include:

• Study all relevant sections of the Oregon CDL Manual for your license class and endorsements
• Take our free practice tests
• Create a study schedule rather than cramming
• Make flashcards for technical terms and concepts
• Focus extra time on air brakes and hazmat
• Review pre-trip inspection procedures
• Study Oregon specific regulations, especially for mountain driving and chains
• Learn vehicle systems and components
• Understand required documentation and procedures
• Learn about Entry Level Driver Training (ELDT) requirements if applicable

Study for several weeks rather than cramming. Many applicants underestimate the technical knowledge required for endorsements.

Yes! Our free Oregon CDL practice tests offer:

• Identifying knowledge gaps and weak areas
• Building confidence through repeated practice
• Simulating the actual test environment
• Tracking your progress as you improve
• Explanations for correct and incorrect answers
• Familiarizing you with question types on the actual test

These practice tests cover all CDL test categories and are updated regularly to reflect current testing standards. Using practice tests increases your chances of passing on the first attempt.

To pass Oregon's CDL knowledge test:

• Start studying 2-3 weeks before your test
• Focus on understanding not memorizing
• Use practice tests to identify and strengthen weak areas
• Get plenty of rest the night before
• Eat well before the test
• Read each question carefully
• Watch for "always," "never," or "except"
• Choose safety-oriented answers when unsure
• Review all answers if possible
• Stay calm and focused

Sample question: When should you use turn signals in Oregon?

• Only when other vehicles are present
• At least 100 feet before turning
• Just as you begin to turn
• Only when changing lanes

Answer: B. At least 100 feet before turning

Our practice tests cover the same topics and format as the official test, but questions will be different. Questions are designed to match the style, difficulty and content of the actual CDL knowledge test. Practice tests help you get familiar with:

• Question formats and wording
• Content coverage and depth
• Time management
• Critical thinking required for the test

Focus on understanding not memorizing, as the actual test draws from a large question bank and each test is unique.

CDL knowledge tests are available at Oregon DMV offices that offer commercial licensing services. Not all DMV offices provide CDL testing, so check the Oregon DMV website or call ahead to verify. Testing locations have specialized equipment and staff for CDL testing. Major testing locations include Portland, Salem, Eugene, Medford, Bend and other cities throughout Oregon.

Yes, appointments are recommended for CDL knowledge tests in Oregon. You can schedule through:

• Oregon DMV website
• DMV Customer Assistance at 503-945-5000

Some locations may accept walk-ins, but wait times can be long and you may not be accommodated the same day if capacity is reached. Scheduling an appointment ensures testing at your preferred time and location.

No. Oregon requires all CDL knowledge tests to be taken in person at authorized DMV offices. This ensures proper security, identity verification and test integrity. This in-person requirement is mandated by federal regulations and applies to all states, not just Oregon. In-person testing prevents cheating and confirms the person receiving the CDL is the one who demonstrated the required knowledge.

For your Oregon CDL knowledge test, bring:

• Valid Oregon driver license
• Social Security card or number
• Proof of citizenship/legal residency (birth certificate, passport, permanent resident card)
• Proof of Oregon residency (two documents showing your Oregon address)
• Current DOT Medical Certificate (Form MCSA-5876)
• Completed CDL application
• Payment for applicable fees
• For Hazardous Materials testing: Additional identification documents for security background check

Also bring:

• Reading glasses if needed
• Appointment confirmation
• Information about your medical history for certification

All documents must be original or certified copies, not photocopies. Contact the DMV beforehand if you're unsure about document requirements.

Plan to arrive 15-20 minutes before your scheduled test time to allow for:

• Document verification
• Application processing
• Fee payment
• Getting settled before testing begins

Arriving late may require rescheduling. First-time applicants should arrive 30 minutes early to allow for additional paperwork. Consider potential traffic delays and parking challenges at DMV offices when planning your arrival time.

After passing the required knowledge tests, you'll receive a Commercial Learner Permit (CLP) valid for 12 months with these restrictions:

• You must wait at least 14 days before taking the skills test
• You can only drive with a qualified CDL holder in the passenger seat
• No passengers are allowed except supervisors, trainees, or examiners
• You cannot transport hazardous materials
• Any tank vehicle you operate must be empty
• Additional restrictions may apply based on vehicle type/endorsements

Your CLP will display the endorsements for which you've passed the knowledge tests.

With an Oregon CLP, you can practice driving commercial vehicles under the supervision of a qualified CDL holder (at least 21 years old with appropriate endorsements) to develop skills for the CDL skills test. The supervision requirement means a qualified CDL holder must be seated next to you whenever you operate a commercial vehicle. This practice period is essential for building the skills and confidence needed to pass the behind-the-wheel test.

If you're a new CDL applicant (after February 7, 2022), you must also complete the required Entry Level Driver Training (ELDT) with a registered training provider before taking your skills test. The training must cover theory and behind-the-wheel instruction specific to the CDL class and endorsements you're seeking. You can find registered training providers on the FMCSA Training Provider Registry.

In Oregon, CDL knowledge test scores remain valid for 12 months, matching the validity period of your CLP. If your CLP expires before you complete the skills test, you'll need to retake all knowledge tests. There are no extensions on score validity, so plan to complete your skills test within the 12-month window to avoid repeating the knowledge tests. This ensures your knowledge remains current when you receive your full CDL.

If you fail an Oregon CDL knowledge test:

• You can retake the failed test as soon as the next day
• Only the specific tests you failed need to be retaken
• Use our practice tests to focus on problem areas
• Review incorrect answers to understand your mistakes
• Consider alternative study methods if you continue to struggle with certain topics

Oregon doesn't limit how many times you can retake the tests, but repeated failures suggest a need for more thorough preparation.

Sample question: What happens if you fail a section of the test in Oregon?

• Wait 30 days before retesting
• Retest immediately at another location
• Wait until the next day to retest
• Retest all sections, even those passed

Answer: C. Wait until the next day to retest

After holding your CLP for at least 14 days and completing any required Entry Level Driver Training:

• Contact a CDL third-party tester or DMV at 503-945-5000
• Ensure your CLP and medical certificate are still valid
• Arrange for an appropriate test vehicle that matches your CDL class
• Pay the skills test fee ($70 for Class A, $70 for Class B/C)
• Choose a date and time from available slots

The skills test consists of three parts: pre-trip inspection, basic vehicle control, and on-road driving demonstration. Make sure you're prepared for all three parts before scheduling your test. Visit oregon.gov/odot/dmv for the most current information on skills testing locations and requirements.