A Marine terminal influences the flow of traffic which sails at a lower speed and is congested. Navigation must be in accordance with the total amount of traffic and not, as in the open sea, in accordance with one or two other ships. Shore based authority must be accepted. The flow of traffic along the coast passing a terminal meets this congestion, certainly if the terminal is in shallow water frequented by large vessels. Crossing also adds to the congestion for the passing flow of traffic. The congestion will be less if the marine terminal and outer channel can accommodate the total traffic flow.