What 4 classes of dangerous goods have no divisions?

The four classes of dangerous goods that have no divisions are Class 1 (Explosives), Class 2 (Gases), Class 6.2 (Infectious substances), and Class 7 (Radioactive materials). Each of these classes encompasses a range of hazardous materials that share similar characteristics but do not require further subdivision into divisions. This classification helps in the safe transportation and handling of these goods.