HazMat Basicsmedium
When must a vehicle display hazardous materials placards?
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ANSWER
✓When transporting 1,001 lbs or more of most hazardous materials requiring a placard
Only when crossing state lines with hazardous materials
Only if the material is flammable
Whenever any hazardous material is on board, regardless of quantity
Why: Placards are required when transporting 1,001 lbs or more of a placardable-quantity HazMat material (for most classes), or when transporting any amount of certain particularly dangerous materials like explosives Class 1.1 or 1.2, poison gas (Class 2.3), or radioactive materials (Highway Route Controlled Quantities).
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