CDL Doubles Triples Practice Test (2024)

1. If a trailer does not have spring brakes, to keep the trailer from moving you should:

2. Combination vehicles usually require _________ single commercial vehicles.

3. Headache racks:

protect you from being hit by your cargo.
can blind other drivers.
help you keep weights within legal limits.
None of the above.

4. Move-over laws require drivers approaching a stopped emergency vehicle:

drive on the shoulder whenever possible.
stop and call for help.
slow and move to a lane not next to the stopped vehicle.
increase their speed.

5. How can you tell if a converter dollie has ABS?

There is an ABS system on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is a yellow lamp on the left side of the dolly.

6. When driving double and triple trailers, drivers should:

look far ahead.
allow more following distance.
steer gently and go slowly around corners.
All of the above.

7. If you doubt you have enough space to pass under a bridge, you should:

turn on your 4-way emergency flashers.
turn on your headlights.
go slowly.
drive faster.

8. Empty trucks:

require the same stopping distance than full trucks.
require a greater stopping distance than full trucks.
require a shorter stopping distance than full trucks.
None of the above.

9. The parking brake:

should be used whenever you park.
should be used when you need to apply the brakes firmly.
should be used when driving in bad weather.
All of the above.

10. Combination vehicles have __ air lines.

ND CDL DOUBLES TRIPLES PRACTICE TEST