HazMat HazMat Placarding and Labeling

Question 1

When must a vehicle transporting hazardous materials display placards?

Accepted Answer

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

Answer

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

Question 2

What shape are HazMat placards required to be?

Accepted Answer

Diamond (square-on-point)

Answer

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

Question 3

Where must placards be displayed on a vehicle transporting HazMat?

Accepted Answer

Front, rear, and both sides

Answer

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

Question 4

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

Accepted Answer

The placard for the primary hazard class

Answer

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

Question 5

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

Accepted Answer

It indicates a Class 7 radioactive material

Answer

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

HazMat - Hazardous Materials Endorsement Practice Test