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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Idaho doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The ID CDL doubles triples test covers the following sections of the Idaho CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this ID CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Idaho.
1. Another name for front-end header boards is:
headache racks.
containerized racks.
head belt.
2. If an aggressive driver confronts you, you should NOT:
make eye contact.
ignore gestures.
try to let them pass.
3. The average driver has a reaction time of:
1/8 of a second.
3/4 second to 1 second.
1/32 of a second.
4. If your trailer starts to skid, you should:
steer in the opposite direction.
release the brakes.
pump the brakes.
5. Which of the following statements about backing heavy vehicles is true?
Back to the right side so that you can see better.
Always back as quickly as possible.
You should avoid backing whenever you can.
6. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
greater; less
greater; more
less; more
7. Right after it starts to rain, the road is very slippery. Why?
Because rain is very slippery.
Because the water mixes with oil left on the road by vehicles.
Because black ice may form on the road.
8. During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
open; properly connected
open; not connected
closed; properly connected
9. The minimum amount of tread for rear tires is:
2/32 of an inch
1/32 of an inch
1/64 of an inch
10. The tire load for each tire is stated:
on the side of the tire.
on the tread of the tire.
on the inside of the tire.
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ID Doubles Triples CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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