Practice question

What is the purpose of diamond-shaped Hazardous Materials (HazMat / ADR) warning placards displayed on commercial tankers and freight trucks?

  1. To advertise chemical products for sale
  2. To identify the specific hazard class (e.g., flammable liquid, toxic gas, corrosive, explosive) and UN identification number for emergency first responders during an accident
  3. To show the truck has passed an oil change
  4. To indicate the vehicle driver is a certified chemist

Answer: B — To identify the specific hazard class (e.g., flammable liquid, toxic gas, corrosive, explosive) and UN identification number for emergency first responders during an accident

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