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CDL · Communication Rules

What information can be found on a hazmat placard?

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

The hazard class (by color and symbol), often a 4-digit identification number for the material, and sometimes the hazard class number

  1. A The hazard class (by color and symbol), often a 4-digit identification number for the material, and sometimes the hazard class number
  2. B The delivery time
  3. C The driver's name
  4. D The truck's mileage

Why this is the answer

A HAZMAT PLACARD displays: the HAZARD CLASS indicated by COLOR and SYMBOL (e.g., orange = explosives, red = flammable, green = non-flammable gas, yellow = oxidizer, white = poison/inhalation hazard, etc.); the HAZARD CLASS NUMBER (1-9) usually at the bottom; and often a 4-digit UN/NA IDENTIFICATION NUMBER identifying the specific material. CDL hazmat. This lets emergency responders quickly identify the hazard and look it up (e.g., in the ERG) to respond safely. The diamond shape and standardized colors/symbols are recognized internationally. Knowing what information a placard conveys (hazard class via color/symbol/number, ID number) is core hazmat knowledge.
Source: FMCSA CDL Manual — Hazmat, Placard Information

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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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