🔍 Key Concepts

• Understand what the 4-digit number (1077) on a hazardous materials placard represents under DOT/IMDG rules. • Recall what the color (red) and flame symbol indicate about the hazard class of the cargo. • Know what the number at the bottom (3) of the placard means and what it does not indicate.

💭 Think About

• Ask yourself: Does a hazmat placard ever show the tank volume or the number of tanks in a shipment, or is it identifying something else? • Think about which hazard class uses a yellow placard with a flaming "O" symbol and whether that matches the placard in the illustration. • Consider how you would use the 4‑digit number together with the hazard class to look up the proper shipping name of the cargo in the IMDG Code or Emergency Response Guidebook.

✅ Before You Answer

• Verify that red with a flame symbol and the number 3 corresponds to a specific hazard class under DOT/IMDG (what class is that?). • Confirm that the 4‑digit number 1077 is a UN/NA identification number for a specific substance, not a measurement of volume. • Make sure you understand that the bottom number on a placard is the hazard class, not a count of containers or tanks.