The shipping routes in coastal waters are always crossed amid with dense traffic. Transit capacity of the shipping routes in coastal waters and traffic flow saturation in the traffic-intensive waters should be quantitatively studied. In this study, a ship traffic flow simulation platform based on the environmental stress model, encounter situation identification model, and collision avoidance decision model is proposed to assess the traffic flow saturation in waters of the coastal ship routing system. This platform can realize the autonomous navigation of simulated ships departing at different intervals on the setting route and realize the automatic avoidance of ships according to the 1972 International Regulations for Preventing Collisions at Sea(1972,COLREGS) in line with the current local navigators' collision avoidance experience. This study choose No.3 precautionary area of Qiongzhou Strait as the study area. It is a creative and accessible way to propose the total ship unsafe passing distance ratio as the evaluation index of ship traffic flow saturation. Fully considering the different factors affecting transit capacity in the No.3 precautionary area of Qiongzhou Strait, the traffic flow saturation level is calculated quantitatively based on the ship traffic flow simulation platform.
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