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CDL Hazardous Materials Endorsement (HME)Communication RulesMedium

A driver is transporting a shipment of UN1072, Oxygen, compressed, Class 2.2, in a cargo tank. The cargo tank has a capacity of 3,500 gallons. What placard is specifically required for this shipment?

  1. AA 'FLAMMABLE GAS' placard.
  2. BAn 'OXYGEN' placard.
  3. CA 'DANGEROUS' placard.
  4. DA 'NON-FLAMMABLE GAS' placard.
Show answer & explanation

Correct answer: B. An 'OXYGEN' placard.

For shipments of UN1072, Oxygen, compressed, in a bulk packaging (like a cargo tank), the specific 'OXYGEN' placard (with the appropriate hazard class number) must be used instead of the general 'NON-FLAMMABLE GAS' placard. This is a specific placarding requirement for oxygen.

Why the other options are wrong

  • A. Oxygen is a non-flammable gas, so a 'FLAMMABLE GAS' placard would be incorrect.
  • C. A 'DANGEROUS' placard is typically used for mixed loads when no single material meets a primary placarding threshold, not for a specific bulk material like oxygen.
  • D. While oxygen is a non-flammable gas, the specific 'OXYGEN' placard is required for bulk shipments of UN1072.

Specific Oxygen Placard

For bulk shipments of UN1072, Oxygen, compressed, the 'OXYGEN' placard must be displayed.

  • Applies to UN1072, Oxygen, compressed.
  • Required for bulk packaging (e.g., cargo tanks, portable tanks).
  • Replaces the general 'NON-FLAMMABLE GAS' placard.

Memory trick: Oxygen in bulk, special blue, 'OXYGEN' placard's for you.

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