To decide which placards to use, you need to know the amount being shipped, the material's hazard class, and _________.

Column 3: Shows a material's hazard class or division, or the entry "Forbidden". Never transport a "Forbidden" material. Placard shipments are based on the quantity and hazard class. You can decide which placards to use if you know these three things:
- Material's hazard class.
- Amount being shipped.
- Amount of all hazardous materials of all classes on your vehicle.