What must accompany hazardous materials during transportation?

The correct answer emphasizes the importance of having a manifest and proper labeling accompany hazardous materials during transportation. A manifest is a detailed document that lists the hazardous materials being transported and provides essential information for authorities and responders in case of an incident. This document helps ensure that all parties involved in the transport process are aware of the materials' nature, quantities, and any specific handling precautions.

Proper labeling is equally crucial because it allows for immediate recognition of the risks associated with the materials. Labels convey information about the hazards, such as flammability, toxicity, or corrosiveness, which assists emergency responders in taking appropriate actions during any incidents or emergencies. This combination of a manifest and correct labeling not only complies with legal and safety regulations but also enhances safety throughout the transport process.

While other choices, such as emergency response kits or written instructions for drivers, provide valuable support for safety and readiness in emergencies, they do not fulfill the regulatory requirement of documentation and communication of hazards that a manifest and proper labeling do. Similarly, while insurance papers are important for liability purposes, they are not a requirement for the safe transport of hazardous materials.