Idaho CDL Hazmat: Hazard Classes Test 2026

Hazardous materials are sorted into nine classes, and the Idaho hazmat hazard classes test makes sure you can tell an explosive from a corrosive without hesitating. This is a core piece of the 2026 Idaho CDL hazmat endorsement, since the class of a material drives nearly every rule that follows.

On the hazard classes portion you match placards, division numbers, and material names to the correct class, from Class 1 explosives through Class 9 miscellaneous. Idaho drivers who master the hazard class table find that placarding, shipping papers, and loading questions all get easier, because everything ties back to correctly identifying the hazard class.

The count of questions on this H endorsement topic is set by the state, so pull up your Idaho CDL Manual and verify it instead of assuming. Cycle through this hazard classes practice test until the nine classes are second nature, and the rest of the 2026 hazmat exam falls into place.

Keep going:

• Idaho Hazmat Practice Test
• Idaho Hazmat Practice Test 2
• Idaho Hazmat Practice Test 3
• Idaho Hazmat Endorsement Test
• Idaho CDL Practice Test
• Idaho Air Brakes Practice Test
• Idaho CDL Combination Practice Test
• Idaho CDL Pre-Trip Inspection Practice Test
• Idaho Class A CDL Practice Test
• Idaho CDL Practice Test

Every question traces back to the Idaho CDL Manual - skim the right-of-way and signs chapters before your retake.