Oklahoma's CDL manual and DMV CDL Practice Tests

for all endorsements

Oklahoma's CDL Manual

Commercial Driver Handbook

Oklahoma adopted the Federal Commercial Motor Vehicle Safety Act of 1986, and is part of a nationally uniform system of classifying, testing, and licensing commercial vehicle drivers. To drive a commercial vehicle, applicants must be at least 18 years of age to drive within the state of Oklahoma, and at least 21 to drive state to state or transport hazardous materials. More information can be found at the Oklahoma Department of Public Safety site.

Minimum Requirements For Getting A CDL In Oklahoma:

  • Must meet requirements for an Oklahoma Driver’s License.
  • Certify that you are in agreement with state motor carrier safety regulations.
  • Provide a valid Medical Examiner’s Certificate.
  • Provide proof of identity.
  • Provide proof of legal presence.
  • Provide proof of Oklahoma residency.
  • rovide your Social security number.

Oklahoma CDL Disqualifications Your CDL and privilege to drive a commercial vehicle are subject to federal regulations, which include the following disqualifications:

  • 1 year for first violations of major offenses. Major offenses include, but not limited to, refusal to take a drug or alcohol test, DUI or other drug related offense*, hit and run, or using your commercial vehicle to commit a felony.
  • Lifetime for second violation of major offenses.
  • 3 years for first violation while transporting hazardous materials, lifetime for a second offense.
  • 60 – 120 days for multiple serious traffic violations within 3 years. These violations include, but not limited to, speeding, reckless driving, and driving without the necessary endorsements.
  • 60 – 120 days for railroad highway grade crossing violations, depending on the number of violations committed.
  • Your CDL may also be suspended/disqualified for violations committed in a non-commercial vehicle.

*A Blood alcohol concentration (BAC) of 0.04% will result in a charge of driving under the influence, and a refusal to take a drug or alcohol test will result in the loss of both your standard driver license and commercial driver license.

DMV CDL Practice Tests

General Knowledge

The general knowledge test is the first of several tests that you will have to complete in order to get your CDL. The questions cover general information about commercial vehicles, driving, and vehicle inspections. The test has a total of 50 questions, and requires at least 40 correct answers to pass.

Air Brakes

You must have an Air brake endorsement on your driver's license to drive a vehicle equipped with an air brake system. This test will test your knowledge of the function, parts, and braking distance of air brakes. The test will consist of 25 questions, and at least 20 correct answers are needed to pass.


The combination endorsement allows you to drive a vehicle with a power unit and one trailer. This test will cover the "ins and outs" of operating articulated vehicles. The exam consists of 25 questions, and requires at least 20 correct to pass.

Hazardous Material

The Hazardous Material endorsement allows the driver to operate a vehicle containing items such as poisons, explosives, flammables, etc. You will also have to pass the TSA Hazardous Material Threat Assessment to get this endorsement. There are 30 questions, 24 correct required to pass.


The Tanker endorsement allows the driver to operate a vehicle weighing more than 26,000 pounds designed to transport any liquid or gaseous material within a tank that is permanently or temporarily attached to the vehicle. There are 20 questions, 16 correct required to pass.

Doubles / Triples

The Doubles/Triples endorsement is required for drivers to pull 2 trailers (doubles) or 3 trailers (triples) connected to a single power unit. There are 20 questions on this test, and 16 correct answers are required to pass.


Bus drivers must have a commercial driver's license with a passenger endorsement in order to operate a vehicle which seats 16 or more, including the driver. There are 20 questions on this test, and 16 correct answers are required to pass.

School Bus

School Bus Endorsement is required for any driver who operates a school bus. After the permit tests the training can be only completed by a local school district. There are 20 questions on this test, and 16 correct answers are required to pass.

Pre Trip Inspection

The Pre-Trip exam is an oral exam where you are expected to check the vehicle parts to insure it is safe for road use. The amount of parts you need to check increase with the size of the vehicle, and by type of vehicle.