HazMat Placarding and Labeling Flashcards

When must a vehicle transporting hazardous materials display placards?

Answer: When required based on the material's hazard class and quantity

Placards are required based on the specific hazard class and quantity thresholds defined in 49 CFR Part 172.

What shape are HazMat placards required to be?

Answer: Diamond (square-on-point)

Federal regulations require HazMat placards to be diamond-shaped (square-on-point) and at least 250 mm (9.84 inches) on each side.

Where must placards be displayed on a vehicle transporting HazMat?

Answer: Front, rear, and both sides

Placards must be displayed on the front, rear, and both sides of the vehicle for a total of four placards.

Which placard is used for materials that are poisonous and flammable?

Answer: The placard for the primary hazard class

When a material has multiple hazards, the placard for the primary hazard class (highest danger) is used unless specific regulations require both.

What does a white square-on-point background on a placard indicate?

Answer: It indicates a Class 7 radioactive material

A white background with a trefoil symbol on a square-on-point placard indicates Class 7 radioactive materials.

If a HazMat label falls off a package during transport, what must you do?

Answer: Stop and re-label the package before continuing

If a required label is missing or falls off, the package must be properly re-labeled before the vehicle continues.