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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. Combination vehicles have __ air lines.
2. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
50 miles
20 miles
3. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
get out of the vehicle and away from the tracks.
have a helper push your vehicle.
4. Transporting hanging meat requires special attention. Why?
Because refrigerated trucks have less traction.
Because you have to drive fast to get it delivered fresh.
Because hanging meat can be an unstable load with a high center of gravity.
5. When approaching a vehicle with a distracted driver, you should:
change lanes quickly.
maintain your safe following distance.
quickly pass the vehicle.
6. If you unlock the pintle hook with the dolly still under the rear trailer:
the brakes could be damaged by the combined forces of the springs and the air pressure.
the dolly tow bar may fly up.
your vehicle might roll away.
7. To secure the tractor you should:
Check that the kingpin and the fifth-wheel are aligned.
Put on the parking brake and put the transmission in neutral.
All of the above.
8. If during vehicle inspection a tire is too hot to touch, you should:
remain stopped until the tire cools off.
let air out.
immediately decrease air pressure.
9. A vehicle inspection should be done in the same order each time:
because it is required by law.
so you are less likely to forget something.
because the report must be written in that order.
10. Longer combination vehicles have the tendency to swing wide on turns. This is called:
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ID CDL Combination Test

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