The regulations state, among other things, that: "Exceptions cannot be applied by companies that transport dangerous goods for their own storage, or for internal or external distribution."
However, the provisions of ADR / ADR-S do not apply to:
– Transport of dangerous goods carried out by private individuals, if this goods are packaged for retail sale and are intended for personal or household use or for sports and leisure. This is provided that measures are taken that prevent the contents from coming out under normal transport conditions. When such goods consist of flammable liquids, transported in refillable containers filled by or for private individuals, the quantity must not exceed 60 liters per container and the total quantity must not exceed 240 liters per transport unit. Dangerous goods in IBCs, large packages or tanks are not considered to be packaged for retail sale.
– Transport carried out by companies in connection with their main activities, such as deliveries to or return deliveries from construction sites or construction sites or in connection with measurements, repairs or maintenance work; this in quantities not exceeding 450 liters per package, including IBCs and large packages, and not exceeding the maximum permissible total quantities specified in 188.8.131.52. Measures must be taken to prevent the contents from coming out under normal transport conditions. However, the exceptions in this paragraph do not apply to Class 7. However, transports carried out by such companies for their storage or internal or external distribution do not fall under this exemption rule.
Here you can read more about current regulations (from 8)