Oregon Driver and Motor Vehicle Services (DMV)
Oregon CDL practice tests
How Oregon handles the commercial learner permit, the fees and the skills test.
- General Knowledge24 questions, required of every applicant
- Air Brakes20 questions, skip it and an L restriction applies
- Combination Vehicles18 questions, needed for Class A
- Hazardous Materials20 questions, endorsement H
- Tank Vehicles16 questions, endorsement N
Every knowledge area
The 145 questions are the same in every state. Start with general knowledge, then sit the areas Oregon will write onto the permit.
General Knowledge
Required of every applicant: inspection, control, space and speed management, hazard perception, emergencies and hours of service.
Air Brakes
Air brake knowledge and vehicle checks for applicants who may drive vehicles with air brakes.
Combination Vehicles
Coupling, the fifth wheel, off tracking and trailer swing. Needed for Class A.
Hazardous Materials
Placards, shipping papers, segregation and the security threat assessment.
Tank Vehicles
Liquid surge, baffles, outage and why a tanker rolls over so readily.
Doubles and Triples
Rearward amplification, converter dollies and coupling a second or third trailer.
Passenger Transport
Bus inspection, standee lines, passenger supervision and railroad crossings.
School Bus
Danger zones, loading and unloading, student crossing and evacuation.
What is different in Oregon
Oregon in particular
Oregon does not offer the CDL skills test at any of its own DMV field offices. Every driving skills test in the state has to be scheduled with a state-approved third-party tester, while the DMV itself only handles the knowledge test and final card issuance.
The written exams themselves are federal
Oregon decides the permit rules, the fees and who runs the skills test, but the knowledge you are tested on comes from 49 CFR Part 383 and is the same in every state, which is why the 145 questions here work wherever you apply.
What changes in this state
Commercial learner permit
Oregon requires the commercial learner permit to be issued and held for at least 14 days before an applicant can take the CDL skills test, and the permit is a single, non-renewable credential rather than something a driver can extend.
Oregon DMV, Third Party CDL Testing, checked Aug 28, 2026Fees
An original Commercial Driver's License costs $160.00 and an original Commercial Learner's Permit costs $40.00, fees that took effect January 1, 2024.
Oregon DMV, HB 2100 Commercial Licensing Fee Changes, checked Aug 28, 2026Where you test
Knowledge tests are given at DMV offices, but the CDL skills test is only available through a state-approved third-party CDL tester, not at a DMV field office.
Oregon DMV, Third Party CDL Testing, checked Aug 28, 2026Oregon CDL written exams, in the federal format.
145 cited questions, free, with nothing to sign up for. The permit rules above are Oregon's. The knowledge is 49 CFR Part 383.