ADR pictogram 6.1-Poisonimage/svg+xmlADR pictogram 6.1-PoisonUnited Nations Economic Commision for Europehttps://en.wikipedia.org/wiki/ADR_(treaty)hazarddangerhazardousdangerouschemicalradioactivityflammableexplosiveADRpictogramwarningsignpoisonbiohazardOfficial ADR pictogram (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.