Which of the following is a key requirement under hazardous materials regulations?

Proper labeling and documentation is a key requirement under hazardous materials regulations because these practices are essential for ensuring safety during the handling, transport, and storage of hazardous materials. Labeling provides crucial information about the contents, including hazard warnings, which help responders and handlers to take appropriate precautions. Documentation, such as manifests or shipping papers, allows for tracking and accountability of the materials, ensuring compliance with regulations and enabling efficient emergency response if an incident occurs.

In contrast, the use of personal vehicles, availability of public transportation, and storage in any secure place do not align with specific regulatory requirements related to hazardous materials. Personal vehicles are not typically suitable for transporting hazardous materials without proper compliance measures in place. Public transportation systems are not designed to handle hazardous materials safely, and not all secure places meet the stringent criteria required for hazardous material storage.