Figure 6: Multipurpose crane 37. A mobile crane in this context is specifically designed for port use and different from the self-propelled crane or crane mounted on a road vehicle. Mobile cranes are of great use in multipurpose terminals since they can be used to load and unload ships and also to handle heavy loads in the terminal cargo handling areas. On the other hand, their initial and maintenance costs are twice those of conventional cranes and positioning takes some time. Their lift and reach are equal to those of the cranes described earlier. It should be noted that the jib is hinged sufficiently high to clear containers stacked on deck and can handle all rows without need for changes on board (figure 7 B).