Oklahoma CDL Study Guide
Oklahoma issues Commercial Driver Licenses through Service Oklahoma, a division of the Department of Public Safety. The state follows federal CDL standards and uses the March 2025 edition of the Oklahoma CDL Driver Manual. New drivers must pass written tests, hold a Commercial Learner Permit for at least 14 days, complete Entry-Level Driver Training (ELDT) before the skills test, and pass a road skills exam.
Key Oklahoma numbers
- Minimum age (intrastate): 18
- Minimum age (interstate or hazmat): 21
- CLP hold before skills test: at least 14 days
- General Knowledge passing score: 80%
- General Knowledge test: ~50 questions
- Air Brakes test: ~25 questions (required if your vehicle has air brakes)
- Combination Vehicles test: ~20 questions (required for Class A)
Topics on the Oklahoma General Knowledge test
- Vehicle inspection (pre-trip, en-route, post-trip)
- Driving safely (speed management, space management, hazard perception)
- Transporting cargo safely
- Air brakes (if your vehicle is air-braked)
- Combination vehicles (Class A)
If you fail a test
If you fail a written CDL test, you may retake it after paying a $4.00 retest fee. The same $4.00 retest fee applies to failed skills (drive) tests. Specific waiting periods between attempts are set by Service Oklahoma at the testing location.
Frequently asked questions
How old do I have to be to get a CDL in Oklahoma?
You must be at least 18 to drive commercially within Oklahoma and 21 to drive across state lines or haul hazardous materials.
How many questions are on the Oklahoma General Knowledge CDL test?
The General Knowledge test has 50 multiple-choice questions. You must answer at least 40 correctly (80%) to pass.
How long must I hold the Commercial Learner Permit before testing?
Oklahoma follows the federal minimum of 14 days. You can take the skills test on the 15th day after your CLP is issued.
Is ELDT required in Oklahoma?
Yes. All first-time CDL applicants must complete federal Entry-Level Driver Training before taking the skills test.
Where do I take the CDL test in Oklahoma?
Written tests are taken at Service Oklahoma Licensing Offices. Skills tests are scheduled with state-approved CDL examiners.
Does Oklahoma require a DOT medical card for a CDL?
Yes, for drivers who self-certify as Non-Excepted Interstate. The medical card must come from a certified examiner on the FMCSA National Registry.
Free practice
Start an Oklahoma General Knowledge quiz →
Sources: Oklahoma CDL Driver Manual (March 2025 PDF) Service Oklahoma - CDL First-Time Applicants Service Oklahoma - CDL Endorsements u0026 Restrictions Service Oklahoma - CDL Upgrade DOT Medical Card