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When handling hazardous materials, the requirement for placarding is crucial because it ensures that the nature of the materials being transported is clearly communicated to everyone involved, including emergency responders. Proper placarding provides critical information regarding the type of hazardous material being carried, which is essential for the safe management of any incidents that may occur during transportation. Moreover, placarding assists in determining the necessary precautions that should be taken while handling the materials, enhancing overall safety for both the transport team and the public.

Understanding that not all materials must be placarded and that specific regulations apply to the types and amounts of hazardous materials transported is also essential. This indicates the importance of compliance with the Department of Transportation (DOT) regulations regarding hazardous materials, which includes the correct placarding based on the classification of the materials involved. This ensures adherence to legal and safety standards and helps prevent accidents or mishandling of dangerous goods.