Abstract
In this research, we firstly develop a simple unit for the ship traffic observation system using radar. Secondly, we survey and analyze the speed restrictions implemented at the Bisan Seto Traffic Route as an example. The research also includes the survey of overtaking cases around the adjacent area to the Bisan Seto Traffic Route. The ship traffic at the route is observed by using radar, and the analysis lead the following findings : (1) Comparing the speed by ship's type, cargo vessels tend to reduce speed observing the speed restrictions, however, it is not always true to all the cargo vessels. (2) Comparing the speed by ship's size, vessels of 500 GT or more sail faster than those less than 500 GT. It is revealed that 73.9% of ferry boats do not follow the speed restrictions. (3) The reality of overtaking cases at the Bisan Seto East Traffic Route shows that a lot of dangerous overtaking cases happen at this area. It is also found that the west-bound overtaking vessels sail faster than those east-bound, particularly ferry boats overtake at a speed of 20 knots, which could be very dangerous when the traffic is heavy and many fishing boats are around.
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