What does the number 1005 on a green diamond indicate about a transportation vehicle's contents?

The number 1005 on a green diamond signifies that the transportation vehicle is carrying ammonia. In the United States, the green diamond is used in the context of hazardous materials to denote a non-flammable gas, and the specific identification number is part of a standardized system used for transporting dangerous goods.

Ammonia, with the designation of UN 1005, presents certain hazards, including being toxic and reactive under the right circumstances, which is why proper identification is crucial for safety in transportation. Understanding these codes is essential for first responders and anyone involved in the transportation of hazardous materials as it allows them to quickly ascertain the nature of the threat and take appropriate safety measures.