What does the term "hazard class" refer to?

The term "hazard class" is specifically used to categorize the level of danger associated with certain hazardous materials. Each class is defined by the type of hazard these materials present, such as flammability, explosiveness, or toxicity. This classification system is essential for ensuring that individuals and organizations handle, store, and transport hazardous materials safely and in accordance with regulations. Understanding the hazard class helps in implementing the necessary precautions and responses in case of an incident involving these materials.

Categories like those defining passenger vehicles, charts of insurance rates, or classifications of driving violations do not pertain to the specific dangers tied to hazardous materials. Therefore, the correct answer highlights the critical role that hazard classes play in safety and regulatory compliance within transportation and handling of hazardous substances.