CDL Hazardous Materials (Hazmat) Practice Test — Questions and Answers
Question 1: According to DOT regulations, which document must always accompany a hazardous materials shipment?
- Shipping papers (manifest) describing the hazardous materials (Correct answer)
- A state permit for each state the shipment passes through
- A certificate from the shipper's insurance company
- A copy of the driver's HazMat endorsement only
Correct answer: Shipping papers (manifest) describing the hazardous materials
A shipping paper (manifest) describing the hazardous materials must accompany every HazMat shipment. It must include the proper shipping name, hazard class, UN/NA identification number, packing group, and quantity. The driver must keep it within reach while driving and know where it is at all times.
Question 2: What is the purpose of placards on a vehicle transporting hazardous materials?
- To warn others of the type of hazardous material being transported (Correct answer)
- To indicate the truck's weight class and cargo capacity
- To show the carrier's operating authority number
- To display the driver's endorsement level
Correct answer: To warn others of the type of hazardous material being transported
Placards are diamond-shaped signs placed on all four sides of a vehicle to warn others of the hazardous materials being carried. They indicate the hazard class (e.g., flammable, explosive, poison) using standardized colors, symbols, and numbers, allowing emergency responders to identify the hazard quickly.
Question 3: A leaking package of hazardous materials is discovered in your cargo. What should you do?
- Stop safely, keep others away, and contact emergency services without touching the package (Correct answer)
- Wrap the package in plastic and continue to the destination
- Open the package to identify the leak source
- Place the package outside the vehicle and continue driving
Correct answer: Stop safely, keep others away, and contact emergency services without touching the package
You should not touch the leaking package. Stop at a safe location away from people, water, and ignition sources. Keep others away from the area. Contact emergency services and your dispatcher. Refer to the Emergency Response Guidebook (ERG) for the specific material. Never continue driving with a known leak.
Question 4: What does UN 1203 identify?
- Gasoline (Correct answer)
- Diesel fuel
- Propane
- Acetylene
Correct answer: Gasoline
UN 1203 is the United Nations identification number for gasoline (motor fuel/petrol). UN numbers are four-digit codes assigned to specific hazardous materials or classes of hazardous materials to facilitate international transport. This number appears on placards and shipping papers.
Question 5: When is a HazMat endorsement required on a CDL?
- When transporting materials in quantities requiring placarding or any select agent/toxin (Correct answer)
- Only when transporting explosives or radioactive materials
- Only for interstate shipments of hazardous materials
- Only when the shipment exceeds $10,000 in declared value
Correct answer: When transporting materials in quantities requiring placarding or any select agent/toxin
A HazMat endorsement (H endorsement) is required whenever a driver transports hazardous materials in quantities that require placarding, OR any amount of a material listed as a select agent or toxin. Obtaining this endorsement requires passing a knowledge test and a TSA security threat assessment background check.
Question 6: Which hazard class requires the most caution regarding sources of ignition?
- Class 3 — Flammable Liquids (Correct answer)
- Class 6 — Poisonous Materials
- Class 8 — Corrosive Materials
- Class 9 — Miscellaneous Hazardous Materials
Correct answer: Class 3 — Flammable Liquids
Class 3 (Flammable Liquids) and Class 2 Division 2.1 (Flammable Gases) require the most caution regarding ignition sources. Flammable liquids and gases can ignite from sparks, flames, hot surfaces, or static electricity, creating explosion and fire hazards. No smoking or open flames within 25 feet of a placarded flammable vehicle.
CDL Hazardous Materials (Hazmat) Practice Test
According to DOT regulations, which document must always accompany a hazardous materials shipment?