What does the UN number signify in TDG?

The UN number serves as a unique identifier for dangerous goods and helps classify the hazard associated with those materials. Each UN number corresponds to a specific substance or group of substances that share similar dangerous characteristics. This system, established by the United Nations, facilitates international trade and transport safety by ensuring that all parties involved in the transport of dangerous goods have a clear and standardized way to identify and categorize those goods.

Using a standardized UN number allows for better communication and understanding among different regulatory agencies, transporters, and emergency responders in case of an incident. It is crucial for ensuring that appropriate safety measures are taken and that the goods are handled correctly throughout the transportation process. Other options, while they may reference aspects related to transportation, do not accurately capture the primary purpose of the UN number in the context of the transportation of dangerous goods.