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Topic 01 Hazard classes & roles
How many hazard classes are there in the hazardous materials classification system?
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Try the mock examSection 9 · 30 topics
The whole syllabus. Piece by piece.
Pick a topic and turn the unfamiliar into the familiar.
SECTION 9 / 01
Hazard Classes and Roles
SECTION 9 / 02Placards
SECTION 9 / 03Shipping Papers
SECTION 9 / 04Packaging, Marking, and Labels
SECTION 9 / 05Loading and Segregation
SECTION 9 / 06Driving, Parking, and Routing
SECTION 9 / 07Emergencies, the ERG, and Reporting
SECTION 9 / 08Hazard Classes and Definitions, Deep Dive
SECTION 9 / 09Placards, Advanced
SECTION 9 / 10Shipping Papers, Advanced
SECTION 9 / 11Marking and Labels, Advanced
SECTION 9 / 12The Segregation Table, §177.848
SECTION 9 / 13Loading, Unloading, and Cargo Tank Operations
SECTION 9 / 14Tank Vehicle Handling
SECTION 9 / 15Driving, Parking, Routing, Tires, and Equipment
SECTION 9 / 16Incident Reporting, Advanced
SECTION 9 / 17Radioactive Materials, Security Plans, Training, and Endorsements
SECTION 9 / 18The Segregation Table, Specialty Set (§177.848(d) Remaining Pairings)
SECTION 9 / 19Reading and Using the Tables (§177.848(a), (b), (c), (e), (f), (g), (i))
SECTION 9 / 20Loading Rules by Class (§§177.838, 177.839, 177.840, 177.841)
SECTION 9 / 21Security Plan Triggers, Item by Item (§172.800(b))
SECTION 9 / 22Portable Tank Marking and Depth Review
SECTION 9 / 23Safety Permit Thresholds for Inhalation Hazards (§385.403(c), (d), (e))
SECTION 9 / 24What Goes on the RADIOACTIVE Label (§172.403(g))
SECTION 9 / 25Cargo Tank Periodic Tests and Inspections (§180.407(c))
SECTION 9 / 26The ERG Green Section: Protective-Action Distances, Framework
SECTION 9 / 27Cargo Checks on the Road (§392.9)
SECTION 9 / 28Cryogenic Hydrogen Cylinders (§177.840(a)(2))
SECTION 9 / 29The Named Materials of §172.800(b)(10)
SECTION 9 / 30Depth and Review: Verified but Never Asked
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Are these actual exam questions?
No. These are original practice questions based on the official CDL handbook and 49 CFR. Each answer includes a source so you can check the rule yourself.
What does the practice cover?
Section 9 topics including hazard classes, placards, shipping papers, loading, cargo tanks, driving rules, emergency response, and security.
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Does this replace required training?
No. This site is a practice resource for the knowledge test. Refer to your state’s official CDL handbook and the relevant agencies for current application and training requirements.