What are the four types of placards used in hazardous materials transportation?

The correct answer identifies specific placards that are utilized in hazardous materials transportation to communicate the nature of the risks associated with particular materials. Placards serve as a visual signal to emergency responders and others about the potential hazards present.

The terms "Dangerous," "Radioactive," "Explosive," and "Non-Flammable Gas" represent categories of hazards that various hazardous materials might pose. For instance, a "Dangerous" placard is used for materials that could present an immediate risk, while a "Radioactive" placard indicates the presence of radioactive materials that may emit radiation. An "Explosive" placard highlights materials that can detonate or explode under certain conditions, which is crucial for safe handling. Lastly, a "Non-Flammable Gas" placard marks gases that do not easily ignite and must be handled differently from flammable gases.

This categorization is essential for ensuring safety during the transport of hazardous materials, as it provides crucial information that guides the responses of handling crews and emergency responders. Recognizing these specific hazards helps to mitigate risks associated with transport incidents.

The other options, while they contain terms that relate to hazardous materials, do not represent the recognized placarding system used specifically for hazardous material transportation. This distinction is central to ensuring