Many cases of marine traffic simulation have been practiced to improve in efficiency and safety marine traffic. But mainly method of appraisement of marine traffic is qualitative analysis. And quite honestly, the quantitative analysis has never fixed. In this study, we have practiced marine traffic simulation with micro model, changing the important marine traffic factors as crossing angle of traffic, vessel length, and vessel speed, etc., and we have tried safety assessment of marine traffic with some measurements. And we have known, it is effective to express the marine traffic situation that count the vessel that affect avoid motion. Somewhere else, we have attempted to investigate safey limit problem of marine traffic.
