- Updated for March 2025
- Based on 2025 AL commercial driver's license manual
Free AL CDL Double/Triple Trailers Practice Test 2025
In the United States, there are three main classes of Commercial Driver Licenses (CDLs). A Class A CDL is typically for operating combination vehicles, such as semi-trucks and tractor-trailers. A Class B CDL generally is for operating large buses and straight trucks, including box trucks and most dump trucks. A Class C CDL is typically for operating smaller buses (including shuttle buses) or smaller trucks carrying hazardous materials.
No matter which class of CDL you plan to obtain, you must pass the General Knowledge test. To drive combination vehicles, you must obtain a Class A CDL, for which you must also pass the Combination Vehicles knowledge test on the theory of operating combination vehicles. (Then you must pass a skills test in this type of vehicle.) And if you want to drive combination vehicles with two or even three trailers, you must also obtain a Double/Triple (T) endorsement on your Class A CDL. (However, triple trailers are prohibited in Alabama.) To get this 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. (No special skills test is required for this endorsement.)
All these knowledge tests are based on the official Alabama CDL manual (Alabama CDL Handbook 2025). You likely studied parts of this manual to get your CDL. But if you’ve found it tough to learn enough from this handbook (especially Chapter 7: Doubles and Triples) to pass the Double/Triple knowledge test, you probably need more help.
This Alabama Doubles and Triples Endorsement Practice Test is based on the official CDL manual, just like the official Double/Triple knowledge test. It’s up to date as of March, 2025. This practice test has 20 multiple-choice questions and answers on air lines, converter dollies, coupling, following distance, rearward amplification, and rollovers.
Our AI Assistant can give you a hint if you get stuck on a question or an immediate explanation of the correct answer if you still miss the question. There’s no time limit; take all the time you need to learn and master the material covered by this practice test. Not satisfied with your final score? You can retake this practice test as often as you wish.
- 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 AL DMV 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 the rearmost 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.
- Which of these statements about checking your mirrors is true?
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