SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cdl-nine-hazard-classes

How many hazard classes are hazardous materials sorted into?

Nine.

Start playing free

  1. Five
  2. Nine ✔
  3. Twelve

Why: A material's hazard class reflects its risks. There are 9 classes, from Class 1 explosives to Class 9 miscellaneous hazmat.

Huh, didn't know that: Class 7 is radioactive material and Class 8 is corrosives.

The dad joke
Why did the trucker study so hard? He wanted to make the grade, not just climb it.
Like this card?
Play the game

References

Answer: Nine. A material's hazard class reflects its risks. There are 9 classes, from Class 1 explosives to Class 9 miscellaneous hazmat.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    There are 9 different hazard classes.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Cars & DrivingA major offense, like leaving the scene of an accident, happens while hauling placarded hazmat. What is the first-offense disqualification?Cars & DrivingWhat kind of hazardous material is Class 2?Cars & DrivingTable 2 hazmat needs placards when the total amount reaches how much?

That's stuff everyone should know.