6 Evaluation of main traffic congestion degree for restricted waters with AIS reports

This paper is organized as follows: Section 2 presents the features of marine traffic congestion, the traditional methods to determine it and their disadvantages. Section 3 proposes a fuzzy reasoning model to determine the main traffic congestion degree with main traffic flow velocity. Section 4 illuminates the method to calculate the main traffic flow velocity with AIS reports. Finally, main conclusion and discussion are offered in section 5.