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Double Triple Test | Oklahoma 2026 #1 Page 3 of 3
Train for FREE with our Oklahoma CDL double triple practice test online. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a OK CDL double triple license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements may vary from state to state.
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15 . How can you check hydraulic brakes?
Check hydraulic brakes by pumping the brake pedal three times before applying firm pressure to the pedal for five seconds. The pedal should not move. If it does, there may be a leak or some other problem in the braking system.
16 . You should test the low pressure warning signal by:
It is essential that your low pressure warning light functions properly. After allowing the system to charge, you can test the warning signal by rapidly applying and releasing the brake pedal. This will release air from the braking system and the warning signal should come on when pressure drops to a dangerous level.
17 . You must have an air brake endorsement:
You must take an air brakes knowledge test to become licensed to operate a vehicle that is equipped with air brakes, including an air over hydraulic braking system.
18 . Before entering a curve, you should:
It is important that the driver of a CMV always downshifts before entering a curve.
19 . How many daily hours of sleep does an adult need to maintain alertness?
Four to five
Being properly rested is essential to the safe operation of a CMV. To maintain alertness, most people need eight to nine hours of sleep per night.
20 . Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
If water and compressor oil are left to build up in an air brake system, the system can be damaged. Air storage tanks are equipped with drains to allow this accumulation to be removed. Manually controlled drains should be operated at the end of each day of driving.
2026 Oklahoma | Frequently Asked Questions
To acquire a CDL Tank endorsement in Oklahoma, you first need a Commercial Driver's License (CDL). Then, study the state's CDL manual section on Tank Vehicles. After studying, you'll take a written knowledge test at a Department of Public Safety testing facility. Passing this test grants you the Tank endorsement on your CDL.
To obtain a CDL Tank license, you must first have a Commercial Driver's License (CDL). It's essential to study the Tank Vehicles section in the state's CDL manual. You'll then need to pass a written knowledge test at a Department of Public Safety testing facility. On passing, you'll receive the Tank endorsement on your CDL.
Specific training or experience isn't mandatory for a CDL Tank endorsement in Oklahoma. However, you need to study the Tank Vehicles section in the state's CDL manual. After that, pass a written knowledge test at a Department of Public Safety testing facility. It's also beneficial to have practical experience driving commercial vehicles.
Yes, to obtain a CDL Tank endorsement in Oklahoma, you must pass an additional written knowledge test focused on tank vehicles. This test covers topics like inspecting tank vehicles, driving tank vehicles, and safe driving rules. The information for the test can be found in the Oklahoma CDL manual's Tank Vehicles section.
The written test for a CDL Tank endorsement in Oklahoma covers various topics including: how to inspect tank vehicles, recognizing high center of gravity and its effects, handling bulk tanks, and understanding the dangers of surge. It also includes rules for safe driving, loading and unloading, and emergency procedures. The Oklahoma CDL manual provides further details.
The CDL Tank endorsement assessment in Oklahoma focuses on knowledge rather than specific driving maneuvers. It evaluates your understanding of inspecting tank vehicles, handling surge, recognizing the high center of gravity, safe driving practices, and emergency procedures. However, you must still demonstrate proficient general driving skills during your CDL road test.
Drivers with a CDL Tank endorsement must adhere to strict safety regulations due to the hazardous nature of the materials often transported. These include limitations on speed, specific loading/unloading procedures, and mandatory rest periods to prevent fatigue. Violations can result in fines, license suspension, or even revocation of the CDL endorsement.
No, liquid or gas materials cannot be transported without a valid CDL Tank endorsement in Oklahoma. This endorsement is required for drivers operating a commercial vehicle that is designed to transport any liquid or gaseous materials within a tank. Driving without the necessary endorsements can result in significant fines and penalties.
To add the CDL Tank endorsement to your current license in Oklahoma, you will need to complete the Tanker Vehicle Endorsement Application and pay the required fee. You may also need to pass a knowledge test specific to tank vehicles. If you meet the requirements, you can add the endorsement to your existing license without having to submit a fresh application.
Yes, handling hazardous materials with a CDL Tank endorsement in Oklahoma requires adherence to specific regulations. Drivers must pass the Hazmat Endorsement Knowledge Test and a TSA background check. They also need to follow safety protocols while loading, unloading, and transporting hazardous materials. Non-compliance can lead to penalties, including loss of endorsement.