Shipping traffic employed moving cargoes which are unloaded by large vessels in major ports for re-shipment or transhipment to their desitnation in smaller vessels. The purpose of this is to economise on the operation of the larger vessels by avoiding delays and expense at the smaller ports, apart from the fact that there could be a Bar Draft, q.v. , or other difficulties for the entry and berthing there of the large ships., lühivedu, tavaliselt mingi teise liini pikendusena