Which of the following must always be marked on documents for dangerous goods?

The nature of the goods must always be marked on documents for dangerous goods to ensure the safety and proper handling of those materials throughout the transportation process. This marking provides crucial information about the specific risks and hazards associated with the goods, facilitating compliance with regulatory requirements and ensuring that all parties involved in the transport, including carriers and emergency responders, are aware of the characteristics of the materials being shipped. Identifying the dangerous goods allows for appropriate precautions to be taken, such as the selection of suitable transport routes, packaging requirements, and necessary safety measures.

Other choices, while potentially relevant in certain contexts, are not universally mandated for dangerous goods documentation. The shipper’s address and destination details are generally important for logistics and communication, but the primary focus in dangerous goods documents must be on the nature and hazards of the goods themselves. Transit time is not a standard requirement for such documentation and may not be as critical as the identification of the goods’ hazards.