What does ADR stand for in logistics?

Also known as the European Agreement concerning the International Carriage of Dangerous Goods by Road, the ADR is a UN treaty concluded in 1957 and updated ever since, according to new rules and regulations in the logistics industry. There are nine different types of classes based on which dangerous goods can be classified and thus, transported. Each class has a corresponding UN Number formed of four digits to help identify hazardous articles, substances or items.