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In this paper the application of the queuing the01y in optimalcapacity planning for general cargo seaport is presented.The seaport as a queuing syslem is defined and tlws, on the basisof the arrival and serviced number of ships in an obsen•edtime unit, the appropriate operating indicators of a port systemare calculated. Using the model of total port costs, the munberof berths and cranes on the berth can be determined wherebythe optimal port system functioning is achieved.

The development of functional and efficient port system requiresthe realization of a common transport system whichwould allow taking advantages of larger areas, lower costs ofrailway traffic and inland wate1way traffic on longer relationsin cooperation with the road transport on shorter relations.The result of the development of intermodal technologiesin the port system is the maintenance of the cwTent and attractingof additional traffic to a certain port, and the reductionof port congestion by providing additional container capacities.Since the competition among ports is becoming moreemphasised by using intermodal technologies, their advantageis obvious. Congestion is one of the main economic points oftransport development. The usage of different fleets in case ofdifferent operators represents the main source of congestionsat terminals and ports resulting in inefficiency of the transportsystem.The aim of this work is to analyze the problems related tocongestions resulting from insufficient usage of intermodaltechnologies in the port system.