CDL Practice Test


Idaho! You will be presented with 40 questions and you must answer 34 questions correctly to pass.  There is a 50 minute time limit.  You may not go back once you answer a question.  Click the "Start Test" button below to begin.  Good luck!

1 / 40

It takes special care to drive tankers with liquid in them because:

2 / 40

Select the true statement about retest markings:

3 / 40

What is always required before loading, driving, or unloading a tanker?

4 / 40

If you are traveling at 55 mph in a 30-foot vehicle, you should leave how many seconds of following distance?

5 / 40

If you are driving a 100-foot truck with double trailers at 30 mph in dry conditions, how many seconds of space should there be between your truck and other vehicles?

6 / 40

Do empty trucks have the best braking?

7 / 40

A safe haven is ______.

8 / 40

A hazard class that uses transport indexes to determine the amount that can be loaded in a single vehicle is _____.

9 / 40

Charter drivers should not:

10 / 40

Buses are prohibited from carrying all of the following hazardous materials except:

11 / 40

Which of the following should you NOT do if you experience a tire failure?

12 / 40

Play of the steering wheel should not exceed:

13 / 40

When arriving at the destination announce:

14 / 40

What position should the tractor protection control valve be in after coupling?

15 / 40

Off-tracking happens when going around a corner and:

16 / 40

The longest crack that brake or disc drums can have is:

17 / 40

There must not be more than_____for engine compartment belts.

18 / 40

Do you need to stop before a railroad crossing if you are hauling 100 pounds of Division 4.3 Dangerous When Wet material?

19 / 40

What kind of surge can occur in a tank with baffles?

20 / 40

A tractor should not be backed under a trailer until the whole air system is:

21 / 40

Your vehicle is going down a long hill and your brakes begin to fail. What should you do?

22 / 40

Do converter dollies have spring brakes?

23 / 40

Why is it dangerous to unlock the pintle hook with the dolly still under the rear trailer?

24 / 40

Why should you cover cargo?

25 / 40

Where should the safety catch for the fifth wheel locking lever be located for coupling to be complete?

26 / 40

The parking brakes should be used____in air brake vehicles.

27 / 40

Select which is not a mandatory emergency equipment:

28 / 40

What does it mean when the safety valve releases air?

29 / 40

The best way to have control on curves is:

30 / 40

Overhead inside mirror is used to:

31 / 40

Select the answer that is controlled by the foot brake.

32 / 40

In what position should the shut off valves on a the rear of the front trailer be in on a set of double trailers?

33 / 40

How far before a railroad crossing should you stop your bus?

34 / 40

Which of the following statements is true about speed management?

35 / 40

The emergency air line is used to:

36 / 40

Select the correct description for a bulkhead tank.

37 / 40

Under which two special conditions should you downshift?

38 / 40

In column 1, the "D" symbol means:

39 / 40

Some school busses are marked with the LNG placard. What does LNG stand for?

40 / 40

The most dangerous time during the school bus ride is:

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CDL Category Practice Tests

CDL Practice Test

How To Get A idaho Commercial Drivers License

Applicants can be age 18 or older when applying for their CDL. Those under the age of 21 are not eligible for the Hazmat or Doubles/Triples Endorsement. All applicants must get a DOT medical card to shows their ability to be physically able to drive a commercial motor vehicle.

Any drivers that fall into the following categories are disqualified from receiving their CDL:

  • Having more than one driver’s license.
  • Being convicted of an impaired driving offense in a commercial vehicle within the prior 24 months to submitting the CDL application.
  • Current suspended, revoked, denied, or canceled driver’s license.
  • Having CDL disqualifications in other states.

All applicants are required to complete a practical skills test and knowledge test in order to receive their CDL. Adding endorsements to a CDL will require additional knowledge tests and practical skills tests.

T – Doubles / Triples
P – Passenger
N – Tank Vehicles
H – Hazardous Materials
X – Tank Vehicle That Carries Hazardous Materials

Hit the Open Road

idaho CDL License Test Tips

Applicants for an Idaho CDL must complete a written knowledge test to showcase their retention of the commercial driving laws. Class A drivers are required to take a 70 question assessment that includes 20 questions specifically about combination vehicles. Class B and C applicants are required to pass a 50 question assessment. Those seeking endorsements and removal of the Air Brake Restriction must take additional tests that range between 20 and 30 questions. All tests must be passed with a score of 80 percent or better.

CDL applicants are required to pass a three-part skills test. These parts include a driving test, basic control skills test, and vehicle inspection test. This can be completed at an Idaho State Driving Facility or other approved testing site.

Additional Information

Information on the Idaho Transportation Department

The Idaho Transportation Department administers the CDL requirements and testing in Idaho. To get more information contact them via:


Phone:  208.334.8000


Additional Idaho CDL Helpful Links

Please use the links below to access more valuable Idaho CDL testing resources and to learn more about practice driving tests for the state of Idaho.