Hazmat & Cargo Basics
8 free questions, part of the General Knowledge CDL practice test
Hazmat and cargo basics cover how to load and secure cargo safely, plus the basics of hazardous materials classification and placarding. Cargo piled high or shifted toward the rear can make a vehicle tip over or steer dangerously light, and DOT hazmat rules sort materials into 9 hazard classes with placards that must measure at least 9.84 inches per side.
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Start Class A CDL Theory ($15)Questions about Hazmat & Cargo Basics
Why is a high center of gravity dangerous on a loaded CMV?
It makes the vehicle more likely to tip over in a curve or sudden swerve, rather than just skid off the road. Load heavy cargo low and light cargo on top to keep the center of gravity down.
How many hazard classes are in the DOT hazmat system?
9. Every hazardous material gets sorted into one of those 9 classes on the shipping paper and placard.
Can you haul a small amount of hazmat without a hazmat endorsement?
Yes, if the quantity falls below the federal placarding threshold. You only need the H endorsement when the load actually requires placards.