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Section 172.334(d) establishes the general requirements for placards bearing identification numbers. The regulations indicate that a placard bearing an identification number may not be used to satisfy the placarding requirements under Subpart F of Part 172 unless it is the correct identification number for all hazardous materials of the same class in the transport vehicle or freight container on which it is displayed.
In this scenario, a transport vehicle contains two different Class 8 materials that require identification numbers and placards. The carrier asks if it is permissible to use two placards with each placard displaying different identification numbers.
In this interpretation, PHMSA addresses requirements for multiple placards bearing identification numbers on the same transport vehicle.
In interpretation Ref. No. 16-0026, PHMSA advises that any placards bearing identification numbers must correspond to the hazard class of the material.