While driving down the Interstate or State Highway System, have you ever thought to yourself, what do those four digit numbers on the placards actual mean on the side of a cargo tank?

The four digit number on a placard identifies the hazardous material which is transported in that vehicle. Each number is associated with a proper shipping name.

For example: The product Sodium Peroxide is identified as UN1504.

The UN in UN1504, is associated with proper shipping names considered appropriate for domestic and international transportation.

If you had an NA before the number, it would be associated with the proper shipping name which is not recognized for international transportation, except to and from Canada.

How many placards are required on a shipping container when transporting a Hazardous Material by Highway?

Each bulk package, 1,001 pounds or more is required to have placards on each side and each end of the container. Make reference to Table 2 of 172.504 of the CFR code.

Any quantity of product from table 1 is also required to have placards on each side and each end of the container.