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The CDL general knowledge test is required to be taken by all CDL applicants. The Idaho CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Idaho CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual ID general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. When should you sound your horn?
When you are about to change lanes.
When you are being tailgated by an aggressive driver.
When using your horn can help avoid an accident.
2. When checking the steering system during your pre-trip inspection you should look for:
mismatched lock rings.
steering wheel play of more than 10 degrees.
cracked drums.
3. B:C type fire extinguishers are suitable for dealing with:
wood fires.
electrical fires and burning liquids.
tire fires.
4. If you are involved in a collision and not seriously hurt, you should:
do your best to care for the injured.
protect the area.
All of the above.
5. When backing a trailer, you should:
turn the steering wheel toward the direction you want to go.
turn the steering wheel in the opposite direction of the turn.
try to position your vehicle so you can back on a curved path.
6. Glad hands are:
securement devices.
coupling devices.
warning devices.
7. To test the service brakes, pull forward at about _____ and apply the brakes firmly using the brake.
5 mph
10 mph
15 mph
8. When water collects on the road. your vehicle can:
stop suddenly.
9. The first thing to do at an accident scene is to:
notify authorities.
keep another accident from happening.
care for the injured.
10. Why should you cover your cargo?
To protect people from spilled cargo.
To protect the cargo from weather.
All of the above.
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ID CDL Practice Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
Number of questions: 50
Correct answers to pass:40
Passing score:80%
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