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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Idaho CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Idaho CDL Manual. Take this practice test now to prepare for the actual ID CDL combination test!
1. When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
100; 150
50; 150
50; 250
2. If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
to one side and as close to the ground as possible.
piled up high with heavy cargo on top.
centered and spread out as much as possible.
3. A bridge formula permits less maximum axle weight for axles that:
have a high center of gravity
are further apart than normal
are closer together
4. Antifreeze:
helps the engine only under hot conditions.
helps the engine under hot conditions as well as cold conditions.
helps the engine only when the temperature is below freezing.
5. When driving on slippery roads, you should NOT:
go slowly.
try to anticipate stops early.
use the engine brake.
6. To prevent a rollover, the driver should:
make quick lane changes if possible.
drive on the shoulder if possible.
drive slowly around corners, on ramps, and off ramps.
7. Which of these statements about brakes is true?
The lighter the vehicle, the more heat the brakes absorb to stop it.
Brake fade does not result from excessive heat.
None of the above.
8. Before transporting sealed loads, you should check:
that you don't exceed gross weight and axle weight limits.
a small sample of whatever is inside.
the special transit permit.
9. When you use your mirrors while driving on the road, you should:
check them quickly.
avoid checking them regularly.
only use the driver's side mirror.
10. Air brakes:
are prohibited on larger vehicles.
should be used only when driving on wet roads.
are an effective way to stop large and heavy vehicles.
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CDL Combination Test (ID)

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