This disharmony in classification between RID/ADR/ADN and IMDG Code will lead to confusion and will delay the international harmonization aimed for by GHS and the UN Recommendations . It may prompt European industry into classifying such substances as dangerous goods of UN 3077 or UN 3082 for all modes of transport ( which is allowed by Special Provisions 909 of the IMDG Code , A97 of the International Civil Aviation Organization 's Technical Instructions/International Air Transport Association 's Dangerous Goods Regulations and 146 of the United States'Code of Federal Regulations 49 ( CFR49 ) , even if they do not meet the criteria of environmentally hazardous substances according to these regulations ) , but this may not be in line with all non-European overland modal regulations .