Most European countries have extensive laws and legislation concerning the transport of dangerous goods by road or rail. These laws are part of the ADR/RID regulations. ADR concerns road transport, while RID is for transport by rail.
ADR - European Agreement concerning the International Carriage of Dangerous Goods by Road
The ADR regulates the international transport of dangerous goods. In all countries that have ratified this agreement it applies to the cross-border transport that occurs between at least two of these countries.
A European directive means that the ADR also applies to the domestic transport in the affiliated countries.
ADR = L'Accord européen relatif au transport international des marchandises dangereuses par route
RID - Regulation concerning the International Carriage of Dangerous Goods by Rail
The RID applies to the international transport of dangerous goods by rail. The affiliated countries come to a mutual agreement as discussed above for the ADR.
RID = Règlement concernant le transport international ferroviaire des marchandises dangereuses