DOT placards are used primarily for what purpose?

The primary purpose of DOT placards is to identify hazardous materials during transport. These placards serve as a vital communication tool, alerting first responders, transport operators, and the general public to the presence of potentially dangerous substances. Each placard features specific symbols and colors that correspond to the type of hazard, such as flammable, explosive, toxic, or corrosive materials.

This identification is crucial for ensuring safety in transportation, as it allows those who may come into contact with the materials to take appropriate precautions. In emergency situations, knowing the nature of the hazardous material can significantly influence response strategies and help prevent accidents or mitigate their impacts.

The other options, while related to transport and safety, do not accurately reflect the function of DOT placards. Identifying safe materials, transporting livestock, and labeling non-hazardous waste do not necessitate the specialized markings and regulations associated with DOT placarding, which is specifically geared towards hazardous materials.