- Updated for March 2025
- Based on 2025 OK commercial driver's license manual
Free OK CDL Double/Triple Trailers Practice Test 2025
In Oklahoma City, I-35 (Texas to Minnesota), I-40 (California to North Carolina), and I-44 (Texas to Missouri) meet to form “America’s Crossroads,” one of the nation’s most important highway junctions. This junction has helped make Oklahoma a central logistics hub. The state’s logistics and intermodal (rail-to-truck) sectors make great use of double-trailer and triple-trailer trucks. (Triple trailers are legal on the state’s turnpikes.) Triple-trailer trucks are used by parcel and Less-Than-Truckload (LTL) carriers.
Oklahoma is also a major regional distribution center for retail chains, such as Walmart. These companies operate doubles to transport products to multiple stores efficiently. The oil and gas industry uses doubles to transport crude oil, drilling equipment, and fuel. The agriculture industry uses double trailers to haul feed, fertilizer, grain, and livestock. Finally, the manufacturing industry uses doubles to transport raw materials, components, and finished goods.
Would you like to pull doubles or triples in one of these economic sectors? You must hold a Class A CDL, be qualified to operate air brakes, and obtain a Double/Triple (T) endorsement on your Class A CDL.
To obtain the Double/Triple endorsement, you must pass the official Double/Triple knowledge test. This test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, pre-trip inspections, rollovers, and trailer sway. (Note that no special skills test is required for this endorsement.)
This knowledge test is based on the official Oklahoma CDL manual (Oklahoma CDL Handbook 2025), especially Chapter 7: Doubles and Triples. However, you may have noticed this manual isn’t easy to learn. We can help you pass this knowledge test on your first try.
This is the first of our Oklahoma Doubles and Triples Endorsement Practice Tests. It’s based on the official CDL manual, like the Double/Triple knowledge test. It’s up to date as of March 2025. The 20 multiple-choice practice questions and answers on this practice test deal with air lines, converter dollies, coupling, following distance, rearward amplification, rollovers, and other topics.
Our AI Assistant can help you figure out the answer to any practice question. You can ask it to give you a hint or rephrase the question. You can also ask your own questions. If you still miss the question, the AI Assistant will immediately give you the correct answer and an accompanying explanation.
This practice test isn’t timed; take all the time you need to learn and master the material covered by this practice test. You can retake this practice test as often as you wish. Each time, the order of the questions will be randomized.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual OK SOK exam
questions
correct answers to pass
passing score
List of questions (classic view)
- When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
- You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
- Empty trucks
- Which of these statements about handling doubles and triples is true?
- Before you can supply air to the air tanks of a second trailer, you need to
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
- How can you be sure that you supplied air to a second trailer?
- What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
- You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
- Which of these statements about managing space to the sides is true?
- The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
- You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
- You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
- You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
- A converter dolly is
- A converter dolly consists of a ______ wheel and ________ axles.
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