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

You should have the fifth wheel plate greased as recommened because:

2 / 40

The best way to test the low air pressure warning signal is to:

3 / 40

What is a king pin?

4 / 40

Which of the following is a necessary qualification for non-bulk packaging?

5 / 40

When should you not use the parking brakes?

6 / 40

If you must stop on the shoulder of the road, you should place warning devices at all of the following places except...

7 / 40

How often should you check your cargo?

8 / 40

Which of the following statements about loading and unloading cargo tanks is false?

9 / 40

This should be cleaned and then adjusted properly while inside the cab.

10 / 40

Select the portion of the combination vehicle that is most likely to turn over suddenly when pulling a double trailer:

11 / 40

Air brake systems should not lose air faster than____when testing for air leakage rates in combination vehicles before applying the brake pedal.

12 / 40

Which of the following must be closed while the bus is in motion?

13 / 40

Before pulling away, make sure the landing gear of the trailer is:

14 / 40

A driver of a tank vehicle should take curves, off ramps, and on ramps at a speed lower than the posted speed limit.

15 / 40

Which of the following is something the driver must watch for:

16 / 40

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

17 / 40

A shipment described on the Hazardous Waste Manifest may only be delivered to another _______ carrier or treatment facility, who then signs the ______, giving you a copy which you must keep.

18 / 40

A bus has a GVWR of 22,000 pounds and seats 24 passengers. What CDL class is this vehicle?

19 / 40

Students exit the bus and walk:

20 / 40

A shipper’s certification is best described as _____.

21 / 40

The belt that you need to make sure is securely mounted, without frays, and adjusts and latches properly is the:

22 / 40

What handling effect will baffles have?

23 / 40

Which of these statements about signaling is correct?

24 / 40

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

25 / 40

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

26 / 40

Select the false statement about suspension:

27 / 40

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

28 / 40

The transport index of a radioactive material:

29 / 40

When does stab braking occur?

30 / 40

How many different hazard classes are there?

31 / 40

What is the main difference between a portable tank and a cargo tank?

32 / 40

If there is rust around the nuts, what may it indicate?

33 / 40

After the initial drop, the maximum leakage rates per minute is:

34 / 40

When inspecting your bus, you must make sure that:

35 / 40

What does the service brake system do?

36 / 40

These tires should have a minimum tread depth of 4/32 inches.

37 / 40

What is incorrect concerning disruptive passengers?

38 / 40

What should you hear when you have the hand valve on and are testing the trailer brakes by opening the service air line at the back of the trailer?

39 / 40

Select the true statement in regards to managing the space to the sides:

40 / 40

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

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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.