A tank trailer is loaded with gasoline UN 1203. Its next load is diesel UN 1202. However the pump and hoses have not been cleaned and still contain gasoline residue, which placard should be displayed on the trailer, 1202 or 1203?
Our approach has been to placard for what is on board the vehicle. If it is emptied and refilled with diesel, then the 1202 placards would be displayed.