Driving · Commercial
CDL Hazardous Materials (H) Endorsement Test
The knowledge test for the H endorsement: hazard classes, shipping papers, placards, loading rules, parking and driving rules, and what to do in a hazmat emergency.
Questions last checked against the official sources on October 10, 2026.
The real exam at a glance
- Questions
- 30 (varies by state)
- To pass
- 80% (24 of 30)
- Time
- About 30 minutes (varies by state)
- Also needed
- TSA security threat assessment
- Renew
- At least every 5 years
- Based on
- Section 9 of your state's CDL manual
What you'll practise
Try a question
Which hazard class uses a transport index to control how much may be loaded?
- Class 1 explosives
- Class 7 radioactive
- Class 3 flammable liquids
- Class 8 corrosives
Show the answer
B. Class 7 radioactive — Some Class 7 packages bear a transport index that controls how many may be loaded together (CDL Manual 9.4.1)
Sample questions by topic (in English)
- Who does what
- Hazard classes
- Shipping papers
- Hazardous Materials Table
- Placarding
- Loading and unloading
- Bulk packaging and tanks
- Driving and parking rules
- Emergencies and reporting
Ask the examiner
Ask about this exam: why an answer is wrong, a grammar point, or “quiz me on …”.
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Questions about the CDL Hazmat
Is this the official CDL Hazmat?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real CDL Hazmat like?
Questions: 30 (varies by state). To pass: 80% (24 of 30). Time: About 30 minutes (varies by state). Also needed: TSA security threat assessment. Renew: At least every 5 years. Based on: Section 9 of your state's CDL manual.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam