FREE HI CDL Doubles/Triples Test 2025 (Practice Test)

1. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?

The front trailer is twice as likely to turn over as the tractor.
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.

2. Too little weight on the driving axles can cause:

3. Blocking and bracing are:

used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.

4. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.

5. What is Gross Vehicle Weight?

The total weight of the cargo
The total weight of a single vehicle, excluding its load
The total weight of a single vehicle, including its load

6. The safety valve is usually set to open at:

7. At dawn, dusk, in rain or snow, to make yourself easier to see you should:

8. What factors can cause brakes to fade?

Slippery surfaces and shaded areas.
Dirt roads and in unpaved yards.
Excessive heat and brakes out of adjustment.

9. Too much weight on the steering axle can cause:

better handling.
hard steering and damage to the steering axle and tires.
poor traction.

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

DOUBLES TRIPLES TEST HI - CDL PRACTICE TEST