The current Master degree thesis is aimed at identifying which could be the effects of ITS (Intelligent Transport Systems) introduced in container terminals, or more generally in ports, as far as heavy-duty vehicles (HDV) queuing is concerned. The thesis work is mainly focused on container movements and handling because of the impressive impacts that gigantism of container vessels is implying and is expected to bring in congestion phenomena within and around maritime terminals. The approach is general and applicable to any port, however the main focus is devoted to the port of Trieste, one of the most relevant and increasing ones in Italy and in the Mediterranean Sea, in terms of container and ro-ro traffic.