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View All Plans- Updated for March 2025
- Based on 2025 AK commercial driver's license manual
Free AK CDL Double/Triple Trailers Practice Test 2025
Alaska’s huge size, difficult climate, and rugged terrain make truck transportation a critical industry. Double tractor-trailers (tractors pulling two trailers) are less common than in the Lower 48. Still, they are used in several key sectors to maximize freight efficiency and reduce fuel costs.
In logistics, double trailers help intermodal and less-than-truckload (LTL) carriers improve their efficiency. UPS and FedEx use double-pup trailers in Alaska as elsewhere. In the state’s key energy sector, some companies employ double tankers to haul crude oil, fuel, or chemicals. Finally, the state depends on food shipments from the Lower 48. Companies like Costco and Carrs-Safeway receive shipments in double-trailer grocery trucks.
Triple trailers are not legally allowed in Alaska.
If you want to pull doubles or triples, you must obtain a Double/Triple (T) endorsement on your Class A CDL. For this endorsement (assuming you are already qualified to drive combination vehicles), you must pass the Double/Triple knowledge test (but no additional skills test). This test covers such topics as safe handling, air brakes, coupling and uncoupling, pre-trip inspections, rollovers, and trailer sway.
This knowledge test is based on the official Alaska CDL manual (Alaska CDL Handbook 2025), especially Chapter 7: Doubles and Triples. You likely studied other parts of this manual to pass your General Knowledge test and Combination knowledge test.
We offer a set of tools to complement the official manual with intensive training. This is one of our tools: the first of five Alaska Doubles and Triples Endorsement Practice Tests. This practice test is 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 address such topics as air lines, converter dollies, coupling, following distance, rearward amplification, and rollovers.
Our AI Assistant can help you answer any practice questions. It can give you a hint or an example or answer any of your own questions about driving. If you still miss the question, the AI Assistant will immediately give you the correct answer and an explanation.
This practice test has no time limit; take all the time you need to learn the material covered by this practice test. Not satisfied with your final score? 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 AK 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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