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CDL · Communication Rules

What is the difference between a 'label' and a 'placard' in hazmat regulations?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Labels are smaller markings on individual packages; placards are larger diamond-shaped signs on the outside of vehicles or bulk containers

  1. A Labels are larger than placards
  2. B Placards are for emergency use only
  3. C Labels are smaller markings on individual packages; placards are larger diamond-shaped signs on the outside of vehicles or bulk containers
  4. D There is no difference

Why this is the answer

Labels are diamond-shaped markings (4 inches per side) applied to individual hazmat packages — boxes, drums, cylinders, IBCs. They communicate the hazard of that specific package to anyone handling it (warehouse workers, shippers, dock workers). Placards are larger diamond-shaped signs (at least 10.75 inches per side) applied to the outside of vehicles, freight containers, rail cars, and large bulk packagings. They communicate the hazard of the load to other road users, emergency responders, and inspectors. Both use the same color and symbol system for each hazard class — a flame for Class 3, a skull for Class 6.1, etc. — so the visual language is consistent from individual package to whole vehicle.
Source: FMCSA CDL Manual 9.2.8 Labels vs Placards

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About this topic: Communication Rules

Communication rules cover shipping papers, placards, labels and markings: what each must show, where papers must be kept in the cab, and when placards are required. This is the most heavily tested hazmat topic. This is one of 19 Hazardous Materials questions on communication rules, each with a full explanation on a single study page.

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