Each food tank trailer (food tank truck), which can be used for the carriage of perishable foodstuffs loads, shall be certified in accordance with the ATP Convention requirements and shall have an ATP Certificate. These ATP  food tank  trailers are protected with a termal insulation. All ATP tankers whose inner dome,  used for the placement of  a bulk or liquid load, is maded from stainless steel material. These ATP food tank semi trailers must have special stickers (Food Grade Cisterns) : "Perishable Foodstuffs", "Foodstuffs only",  “Only for Food Products”,  "Only for Foodstuffs", documents for freight shipping and necessary equipment, and their drivers are not subject to any traffic restrictions during official or public holidays. ATP cistern for foodstuffs (ATP tank lorries) are used only for the hauling of food goods. Before each loading, ATP food tanker undergo cleaning and disinfection according to the special EFTCO programme, including periodic verification, and have their ATP Certificates renewed. The international carriage of liquid products (the international transportation of perishable goods) is regulated by the International ATP Convention and national legal instruments.