ADR formally, the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) is a 1957 United Nations treaty that governs transnational transport of hazardous materials. “ADR” is derived from the French name for the treaty: Accord européen relatif au transport international des marchandises Dangereuses par Route).
Concluded in Geneva on 30 September 1957 under the aegis of the United Nations Economic Commission for Europe, it entered into force on 29 January 1968. The agreement was modified (article 14, paragraph 3) in New York City on 21 August 1975, though these changes only took effect on 19 April 1985. A new amended ADR 2011 entered into force on 1 January 2011. Annexes A and B have been regularly amended and updated since the entry into force of ADR. Consequently to the amendments for entry into force on 1 January 2015, a revised consolidated version has been published as document ECE/TRANS/242, Vol. I and II.
As of 2016, 49 states are party to ADR.