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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 District of Columbia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DC CDL doubles triples test covers the following sections of the District of Columbia CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DC CDL practice test now to prepare for the actual test!
1. Which of the the following statements about fatigue is true?
Fatigue impairs your vision and judgment.
Fatigued driving is one of the leading causes of accidents.
Fatigue may cause you to not see and react to hazards.
All of the above.
2. If you are carrying a heavy load that is slowing you down, you should:
drive on the shoulder.
drive in the right lane.
keep the vehicle in third gear.
drive in the left lane.
3. You should NOT use the parking brakes if:
the brakes are cold.
the brakes are very hot.
the brakes are too dry.
All of the above.
4. If you have to drive off the road, you should:
keep one set of wheels on the pavement, if possible.
leave the road completely.
brake as hard as you can to maintain control.
fully apply the brakes until your speed has dropped to about 20 mph.
5. When connecting to the rear trailer, the trailer height should be:
lower than the center of the fifth-wheel.
higher than the center of the fifth-wheel.
the same height as the fifth-wheel.
None of the above.
6. Your vehicle has air brakes. To stop, you should:
pump the brake pedal 3 times.
push the brake pedal down.
pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
7. When a combination vehicle goes around a corner:
the rear wheels of the trailer will never off-track.
the front and rear wheels follow a different path.
the driver must keep the rear of your vehicle far away from the curb.
All of the above.
8. The best advice for driving in fog is:
use low beams.
use high beams.
drive slowly in the left lane of traffic.
don't drive.
9. Large vehicles take longer to stop when they are:
carrying hazardous materials.
fully loaded.
heavily loaded but not fully loaded.
10. In newer vehicles with air brakes, you put on the parking brake:
using a P-shaped, yellow control knob.
moving the orange push-pull lever to the right.
using a diamond-shaped, yellow, push-pull control knob.
placing the transmission in Park.
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DC Doubles Triples Test

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