HazMat HazMat Placarding and Labeling 1 — Questions and Answers
Question 1: When must a vehicle transporting hazardous materials display placards?
- When carrying any amount of HazMat
- When carrying 1,000 lbs or more of HazMat
- When required based on the material's hazard class and quantity (Correct answer)
- Only when crossing state lines
Correct 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.
Question 2: What shape are HazMat placards required to be?
- Square
- Circle
- Diamond (square-on-point) (Correct answer)
- Rectangle
Correct 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.
Question 3: Where must placards be displayed on a vehicle transporting HazMat?
- Front only
- Front and rear only
- Front, rear, and both sides (Correct answer)
- Rear only
Correct 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.
Question 4: Which placard is used for materials that are poisonous and flammable?
- POISON GAS only
- FLAMMABLE only
- The placard for the primary hazard class (Correct answer)
- Both placards must be displayed
Correct 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.
Question 5: What does a white square-on-point background on a placard indicate?
- The material is non-flammable
- It is used for Division 2.1 flammable gas
- It indicates a Class 7 radioactive material (Correct answer)
- It is an optional display format
Correct 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.
Question 6: If a HazMat label falls off a package during transport, what must you do?
- Continue to destination and report it upon arrival
- Stop and re-label the package before continuing (Correct answer)
- Cover the package with a tarp
- Reduce speed and proceed carefully
Correct 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.
HazMat HazMat Placarding and Labeling 1
When must a vehicle transporting hazardous materials display placards?