As concentration and specialisation of production by industry progresses, so there will be an increase in the quantities and types of cargo carried by specialised ships.
Njengokuba uzikiso ngqondo nobuchule kwimveliso yoqoqosho kusiya kukhula, ngoko ke kuya kubakho ukongezeleleka kubuninzi kwakunye neentlobo-ntlobo zemithwalo ezithwalwa ziinqanawa zohlobo olulodwa.