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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 Missouri doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MO CDL doubles triples test covers the following sections of the Missouri CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MO CDL practice test now to prepare for the actual test!
1.
Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
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anti-lock brakes.
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hydraulic brakes.
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a rear backup camera.
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2.
Before each trip, you must make sure:
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the cargo has a high center of gravity.
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the cargo is balanced and secured.
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your cargo obscures your view to the sides.
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3.
A trailer jackknife is more likely to happen when the trailer is:
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empty.
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loaded to its full capacity.
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overloaded.
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4.
Texting while driving a CMV is:
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acceptable if the message work-related.
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prohibited.
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acceptable if the message less than 140 characters.
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5.
When driving in heavy traffic, the safest speed is:
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the same speed as the other vehicles.
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faster than the other vehicles.
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slower than the other vehicles.
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6.
The tire load for each tire is stated:
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on the inside of the tire.
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on the tread of the tire.
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on the side of the tire.
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7.
When more cargo is piled up in a truck, the center of gravity moves:
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to the left side of the truck.
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higher up from the road.
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closer to the ground.
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8.
Retarders:
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help slow a vehicle and reduce brake wear.
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apply their
braking power whenever
you push on the accelerator.
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help prevent accidents by applying extra braking power to the non-drive wheels.
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9.
You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
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activate your hazard lights and drive to the nearest place where you can stop.
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slow down and test your brakes.
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pull off the road and stop immediately.
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10.
The ABS malfunction lamp on the instrument panel is:
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Red
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Orange
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Yellow
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