View instructions
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. If your vehicle gets stuck on a railroad track, you should:
get out of the vehicle and walk as far away from the tracks as possible.
try to re-start the vehicle.
stay in the vehicle and call for help.
2. If you get stuck on railroad tracks, you should:
get out of the vehicle and away from the tracks.
have a helper push your vehicle.
stay in the vehicle and call for help.
3. Air pressure should build up in a single air system, within about:
3 minutes.
15 minutes.
10 minutes.
4. Overloading can have bad effects on all of the following except:
Exhaust system
5. Which of these is NOT part of the basic method for shifting up?
Release the accelerator, push in the clutch and shift to neutral at the same time.
Accelerate while pressing the clutch and turn toward the driver's side.
Push in the clutch and shift to the higher gear at the same time.
6. When driving, do NOT:
try to help out other drivers by signaling when it is safe to pass.
warn the drivers behind by flashing your brake lights if you see a hazard that will require slowing down.
assume that vehicles, pedestrians or bicyclists see you whenever you are about to pass them.
7. When driving in construction areas you should:
reduce speed to a crawl.
increase your speed.
decrease your speed.
8. When the temperature drops, which of the following surfaces will become icy first?
9. A burning tire must be:
covered with cloth.
immediately removed from the vehicle.
cooled with water.
10. If you see a hazard ahead, you should:
come to a complete stop when safe to do so.
think about the emergencies that could develop and be prepared to take action.
call the emergency services.
Page 1 of 5
Next page

ID CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
Share This Online CDL Test
Rate this CDL Knowledge Test
4.6 out of 5
based on 325 votes