During transport, placards convey information primarily through which of the following?

• A. Expiration date
• B. Weight of the shipment
• C. Manufacturer address
• D. Hazardous signs and symbols

Answer: (D)

Placards are designed to communicate risk quickly using standardized signs and symbols that identify the type of hazard of the cargo. This helps anyone handling the shipment—drivers, responders, and inspectors—know what precautions to take, what PPE to wear, and what actions to avoid or prioritize in an emergency. Expiration dates, weight, and manufacturer addresses aren’t conveyed by placards, but these details appear on other documents or labels. So the main purpose of placards is to display hazard signs and symbols that indicate the nature of the danger.