What are the components of the 4-digit transportation code for hazardous materials?

The correct choice identifies the essential elements of the 4-digit transportation code used for hazardous materials. This code, known as the United Nations (UN) number, is critical for identifying specific hazardous substances during transportation.

The UN or NA number is a unique identifier assigned to each hazardous material, allowing emergency responders and transporters to quickly ascertain the nature of the material, its potential hazards, and necessary precautions. The classification refers to the categorization of the material based on its specific hazards, such as flammability, toxicity, or reactivity, which is vital for safe handling and emergency planning. The specific material identifier further details the substance, ensuring precise identification and effective communication about the risks posed.

The other options do not encompass the necessary components that define the transportation code as accurately as the correct choice. For instance, material type, volume, and owner codes may pertain to transportation logistics but do not serve the specific purpose of hazard identification. Similarly, destination, shipping route, and weight address logistical concerns rather than hazard communication. Lastly, container type, labels, and hazard symbols relate to the packaging and marking of hazardous materials but do not form part of the actual 4-digit code used for their identification during transportation.