Service Oklahoma
Oklahoma CDL practice tests
How Oklahoma 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 Oklahoma 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 Oklahoma
Oklahoma in particular
Oklahoma's CDL process runs through Service Oklahoma, a standalone licensing agency the legislature split off from the Department of Public Safety in 2023, so applicants deal with Service Oklahoma offices and tag agencies rather than a traditional DMV or DPS counter.
The written exams themselves are federal
Oklahoma 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
A commercial learner permit must be held for a minimum of 14 days before the driving skills test can be taken, and the permit itself stays valid for one year.
Service Oklahoma Help Center, CDL License Process, checked Aug 28, 2026Fees
A first-time four-year Class A CDL totals $81.50, made up of a $25 application fee and a $56.50 license fee, while the eight-year Class A option runs $138.00.
Service Oklahoma, CDL First-Time Applicants, checked Aug 28, 2026Where you test
Knowledge and vision testing happen in person at a Service Oklahoma licensing office, while the skills test can be taken at a Service Oklahoma location or through an approved third-party drive school.
Service Oklahoma, CDL First-Time Applicants, checked Aug 28, 2026Oklahoma CDL written exams, in the federal format.
145 cited questions, free, with nothing to sign up for. The permit rules above are Oklahoma's. The knowledge is 49 CFR Part 383.