Problems related
to safety and the environment, as well as economic
consequences, can emerge during any stage of
international transport, from the loading of the goods or
wastes to the intermediate stopovers, from the possible
stops to the final unloading of the goods or waste.These
complex international transport operations, whether
single or multimodal and whether related to hazardous
goods or hazardous waste, are regulated at an
international level by the UN, from a general point of
view and, as far as the five means of transport are
concerned, by the same number of international
agreements.