CDL Hazardous Materials Practice Test 2026
Free CDL Hazardous Materials (HazMat / H endorsement) practice. The H endorsement requires a knowledge test PLUS a TSA Security Threat Assessment (background check). Real test is in English only; native-language explanations + English-term glossary. ~30 questions on the real test, 80% to pass. Practice every question free, then sit a 30-question mock scored to the real 80% pass line.
π CDL pre-trip inspection β step by step
A step-by-step pre-trip checklist β the 7-step method, engine, walkaround and the in-cab air brake check, with the auto-fail points β
π― Practice by Topic
The Intent of the Regulations
Why the hazardous materials regulations exist β to contain the material, communicate the risk, and ensure safe drivers and equipment β plus who does what (shipper, carrier, driver) and the HazMat (H) endorsement requirements including the TSA Security Threat Assessment.
Communication Rules
How hazards are communicated: the nine hazard classes and divisions, recognizing hazardous materials, the shipping paper and proper item description, the shipper's certification, package markings and labels, and the hazardous waste manifest.
Placarding
When hazardous materials placards are required and which to use: Table 1 materials (placarded in any amount) vs Table 2 materials (1,001 lb or more), the diamond placard shape, and placing placards on all four sides of the vehicle.
Loading and Unloading
Safe loading and unloading of hazardous materials: general loading rules, securement, no-smoking and no-flame requirements, and segregation β keeping incompatible materials apart per the Segregation Table (for example, poisons away from foodstuffs).
Bulk Packaging Marking, Loading and Unloading
Bulk packaging and cargo tanks: required tank markings, attending the vehicle during loading and unloading, grounding and handling flammable liquids, and loading compressed gas safely.
Driving and Parking Rules
Driving and parking with hazardous materials: attending the vehicle, the explosives and poison-inhalation-hazard parking distances (5 ft, 300 ft), railroad-crossing stops, tunnel and route restrictions, no-smoking distances, and tire checks.
Emergencies
Responding to hazardous materials emergencies: using the Emergency Response Guidebook (ERG), handling fires, leaks and spills, calling CHEMTREC, and the required incident notification (when to notify the National Response Center).
π Study guides for this exam
π§° Jobs this credential opens
See jobs βπ§ Where this leads β the new immigrant career path
See how this exam fits a step-by-step ladder of U.S. licenses and certs β with median pay and the languages each real exam is offered in β
π What to Bring
- β
Proof of identity & U.S. residency/citizenship
The HazMat endorsement requires a TSA Security Threat Assessment β bring the documents your state/TSA lists.
- β
Existing CDL or Commercial Learner's Permit
- β
TSA Security Threat Assessment application/clearance
Fingerprint-based background check, required before the H endorsement is issued; renew per federal schedule.
π How to Schedule
- 1
Study Section 9 (Hazardous Materials)
Cover hazard classes, shipping papers, markings & placarding, loading/segregation, driving & parking rules, and emergencies.
- 2
Apply & start the TSA Security Threat Assessment
The STA (fingerprint background check) can take weeks β start early; the H endorsement cannot be issued until you clear it.
- 3
Pass the HazMat knowledge test (in English) at your DMV
About 30 questions, 80% to pass. Fees and scheduling vary by state β see the per-state table.
π‘ Test Day Tips
- β’π΄ The HazMat test is English only β learn the key English terms (placard, segregation, shipping paper, Emergency Response Guidebook) even if you study in Chinese/Spanish.
- β’Master the high-stakes safety facts: when placards are required (Table 1 any amount / Table 2 at 1,001 lb), which materials must not be loaded together (segregation), explosives parking distances (5 ft / 300 ft), and emergency numbers (CHEMTREC 1-800-424-9300, National Response Center 1-800-424-8802).
- β’Remember the H endorsement is more than a test β the TSA background check (and its renewal) is mandatory.
π Study Handbook
All practice questions are based on the sections below. Click any to read the official source.
π Official Resources
FMCSA β Commercial Driver's License β
Federal CDL overview, classes, endorsements, and English-language-proficiency rules.
TSA β HazMat Endorsement (Security Threat Assessment) β
The fingerprint-based background check required to get or keep the H endorsement.
Find your state's CDL manual & test info β
Fees and scheduling vary by state (the HazMat test itself is English only) β see your state DMV and our per-state table.
β Frequently asked questions
How many questions are on the CDL Hazardous Materials test, and how many do I need to pass?
The CDL Hazardous Materials knowledge test has 30 questions. You must answer 24 correctly (80%) to pass.
How many questions can you miss on the CDL Hazardous Materials test?
You can miss up to 6 of the 30 questions and still pass.
What should I bring to the CDL Hazardous Materials test?
Proof of identity & U.S. residency/citizenship β The HazMat endorsement requires a TSA Security Threat Assessment β bring the documents your state/TSA lists. Existing CDL or Commercial Learner's Permit TSA Security Threat Assessment application/clearance β Fingerprint-based background check, required before the H endorsement is issued; renew per federal schedule.
How do I schedule and take the CDL Hazardous Materials test?
1. Study Section 9 (Hazardous Materials): Cover hazard classes, shipping papers, markings & placarding, loading/segregation, driving & parking rules, and emergencies. 2. Apply & start the TSA Security Threat Assessment: The STA (fingerprint background check) can take weeks β start early; the H endorsement cannot be issued until you clear it. 3. Pass the HazMat knowledge test (in English) at your DMV: About 30 questions, 80% to pass. Fees and scheduling vary by state β see the per-state table.