CTS Hazardous Materials Transportation & Compliance

Question 1

Which U.S. federal agency has primary authority over the safe transportation of hazardous materials by highway, rail, air, and water?

Accepted Answer

PHMSA (Pipeline and Hazardous Materials Safety Administration)

Answer

PHMSA, a division of the U.S. Department of Transportation, is the primary agency responsible for issuing and enforcing regulations governing hazardous materials transportation.

Question 2

How many hazard classes does the DOT use to categorize hazardous materials under 49 CFR?

Accepted Answer

9

Answer

The DOT recognizes 9 hazard classes, ranging from Class 1 (Explosives) through Class 9 (Miscellaneous Dangerous Goods).

Question 3

What does a UN identification number displayed on a hazmat placard or orange panel identify?

Accepted Answer

The specific hazardous material or group of materials

Answer

UN identification numbers (e.g., UN1203 for gasoline) identify the specific substance or group of hazardous materials, enabling responders to look up proper emergency procedures.

Question 4

Flammable liquids with a flash point at or below 60°C (140°F) are categorized under which DOT hazard class?

Accepted Answer

Class 3

Answer

Class 3 covers flammable liquids, defined as liquids with a flash point of not more than 60°C (140°F) or any material in a liquid phase with a flash point at or above 37.8°C (100°F).

Question 5

What is the minimum required dimension for each side of a DOT hazmat placard displayed on a transport vehicle?

Accepted Answer

9.84 inches (250 mm)

Answer

Per 49 CFR 172.519, placards must be at least 250 mm (9.84 inches) on each side to ensure visibility from a safe distance.

CTS - Certified Transportation Specialist Practice Test

CTS - Certified Transportation Specialist Practice Test

CTS Hazardous Materials Transportation & Compliance