For export loading, however,there is a potential for optimization. In general the transport sequence is not identical to the loading sequence of the ship. The loading strategy. The transport sequence ,however,has to reflect different distances, yard reshuffles and special containers. The latter ones sometimes need special equipment which has to be provided before they can be transported. All effects result in additional transportation times. Therefore, the transport sequence has to be altered to ensure the right order of the loading sequence. Idle times of the cranes and vehical congestions at cranes and stacks have to be avoided because both reduce productivity.