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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. To prevent rollover, you should do all of the following except:
put the lightest parts of the cargo under the heaviest parts.
keep the load centered on your rig.
drive slowly around turns.
2. The trailer hand valve should be used:
to test the trailer brakes.
to check that the trailer is locked onto the tractor.
to check that the trailer emergency brakes are on.
3. When checking the lights before driving:
make sure the parking brake is not set.
you should check them from inside the vehicle.
you should turn off the engine.
4. If your ABS fails:
your tires might grab unexpectedly and you could lose control.
the first step is to get the vehicle off the road and stop.
you will still have normal brake functions.
5. Combination vehicles usually require _________ single commercial vehicles.
less driving skill than
the same level of skill as
more driving skill than
6. While crossing railroad tracks, you should:
shift down.
shift up.
not shift gears.
7. You can determine if your vehicle is equipped with ABS (anti-lock braking system) by:
checking for a yellow ABS malfunction lamp on the instrument panel.
checking if your vehicle was manufactured after March 1, 1998.
All of the above.
8. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
50 miles
20 miles
9. Which of the following is not proper tie-down equipment:
Bungee cords
10. Which of the following will off-track the most?
The rear wheels of the last trailer.
The front wheels of the last trailer.
The rear wheels of the tractor.
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ID CDL Doubles Triples Test

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