Both conditions of the type of cargo and the volume of passengers and goods moving through the port itself. From the centrality view point, the port works as a hub on a wheel. This method of understanding posits that the port is the center of economic activity, and that the spokes of the wheel, or forms of intermodal transportation, should be developed as a function of the port's existence. Many ports act as hubs, and most of them are seaports.

Seaports are not always the terminus of port activity however, and ports can also be viewed as intermediaries between other ports. Often times passengers and cargo are moved to other destinations as they pass through a port. Other times, cargo and people are loaded and unloaded, completely or incompletely as they make their way to and from origin and destination. In this way, ports can be seen as intermediaries between...
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