translate English to French: As many businesses put their dangerous materials on the roads in order to prevent their establishments from being classified as a 'Seveso site', the flows of dangerous materials circulating around the Union are constantly growing, thus increasing the risks of a major catastrophe.
Comme de nombreuses entreprises mettent leurs matières dangereuses sur les routes pour éviter un classement en site Seveso de leurs établissements, les flux de matières dangereuses circulant dans l'Union ne cessent de croître, augmentant d'autant les risques de catastrophe majeure.