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CDL knowledge test

CDL HazMat Practice Test 2026 (Hazardous Materials)

For the H endorsement: hazardous materials rules, communication rules, loading and unloading, bulk packaging marking, driving and parking rules, and emergencies.

69 practice questions, all written from Commercial Driver's License Manual (Version 07/20/2026 (form DMV 60A), AAMVA, Virginia DMV edition). Every answer shows the manual section it comes from. Free, no sign-up.

  • 69 questions
  • 30 per attempt
  • Pass mark: 80%
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Start the HazMat practice test

30 questions. Passing score: 80%. No sign-up needed.

Choose how you want to practice:

Test format

Passing score At least 80% correct (49 CFR 383.135 (eCFR))
Number of questions Varies by state. Check the CDL manual from your state’s licensing agency.
Our practice test 30 questions per attempt, drawn at random from 69. Pass mark: 80%.

Topics covered

  • Communication rules 22 questions
  • Loading and unloading 14 questions
  • Driving and parking rules 12 questions
  • Emergencies 12 questions
  • Shipper, carrier and driver duties 5 questions
  • Intent of the regulations 4 questions

Sample questions

A few questions from the set. Try to answer before opening each explanation.

  1. Sample question 1

    When may you accept the shipper's certification that a package is properly packaged?

    • AUnless a package is clearly unsafe or not HMR compliant
    • BOnly after you open and inspect each package yourself
    • COnly when the shipper is also your own employer
    • DNever, because the driver must re-certify every package
    Show answer

    Answer: A. You can rely on the shipper's signed certification about packaging unless a package is obviously unsafe or out of line with the regulations.

    Source: Commercial Driver's License Manual, Version 07/20/2026 (form DMV 60A), section 9.3.6 Shipper's Certification.

  2. Sample question 2

    You are using DANGEROUS placards for a mixed Table 2 load. You must use the specific placard for a Table 2 material if you loaded how much of it at one place?

    • A1,001 pounds or more
    • B2,205 pounds or more
    • C3,000 pounds or more
    • D5,000 pounds or more
    Show answer

    Answer: B. The DANGEROUS placard cannot stand in for the specific placard of any Table 2 material when 2,205 pounds or more of it was loaded at a single place.

    Source: Commercial Driver's License Manual, Version 07/20/2026 (form DMV 60A), section 9.3.11 Placard Tables.

  3. Sample question 3

    While a vehicle containing hazardous materials is being fueled, where must someone always be?

    • AIn the cab, keeping the engine running
    • BAt the rear of the trailer, watching traffic
    • CInside the station, paying for the fuel
    • DAt the nozzle, controlling the fuel flow
    Show answer

    Answer: D. With the engine shut off, a person has to stay at the fuel nozzle the whole time and control the flow.

    Source: Commercial Driver's License Manual, Version 07/20/2026 (form DMV 60A), section 9.6.7 Refuel with Engine Off.

  4. Sample question 4

    Your vehicle with an empty tank used for Class 3 flammable liquids breaks down. Which stopped vehicle signals should you use?

    • AReflective triangles or red electric lights
    • BFlares, because the tank is now empty
    • CFuses placed on the road behind the vehicle
    • DAny burning signal set at least 100 feet back
    Show answer

    Answer: A. Burning signals are not allowed around flammable liquid tanks even when they are empty, so reflective triangles or red electric lights are used.

    Source: Commercial Driver's License Manual, Version 07/20/2026 (form DMV 60A), section 9.6.4 No Flares!.

  5. Sample question 5

    Whom are the hazardous materials regulations intended to protect?

    • AOnly the shipper and the carrier company
    • BYou, others nearby, and the environment
    • COnly police and firefighters at a crash
    • DOnly the owner of the cargo being moved
    Show answer

    Answer: B. The rules exist to keep the driver, nearby people and the environment safe, not just one business or group.

    Source: Commercial Driver's License Manual, Version 07/20/2026 (form DMV 60A), section 9.1.1 Contain the Material.

How to prepare

  • Read the matching sections of your state’s CDL manual before you practice.
  • Use practice mode first: it shows the explanation and the manual reference after each answer.
  • For every missed question, reread the whole manual section we cite.
  • Switch to exam mode when you score well above 80% without help.

More detail in our guide How to Study for the CDL Knowledge Tests.

Other CDL practice tests

Which tests you need depends on your license class and endorsements, as explained in CDL Classes, Endorsements and Restrictions Explained.

Frequently asked questions

What score do I need to pass?

Federal rules require at least 80% correct on each CDL knowledge test (49 CFR 383.135 (eCFR)).

Are these the questions on the real test?

No. Real test questions are not public. We write our own questions from the official manual, so they cover the same material but are not copies of test questions.

Is the CDL manual the same in every state?

State CDL manuals are built on the same national model manual from AAMVA, so the knowledge content is largely the same. We compared 3 state editions for this test: 69 of 69 quotes appear word for word in the same section of all of them. Your own state’s manual is the final word if anything differs.

How do you check the answers?

Each question stores the manual section (or page) and an exact quote that a script checks against the manual text, then an independent AI review answers it from that part of the manual alone. See our editorial policy. Found a mistake? Tell us.

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30 questions, pass mark 80%. Free, no sign-up.

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Sources

Questions cite the newest edition we have. We also check every quote against the other state editions of the same model manual, section by section.