冒頭に述べた法改正に伴う新たな問題として、追越し禁止による団子状態での並走が発生している。これにより、操船者に負荷を与え、危険な状況が発生していると考えられる。そこで、安全な追越しを判断するツールとして、接近限界距離を用いた追越しの管制方法を提案した。安全な追越しを考える上で、航路内で同航する他船との接近の限界距離をアンケートにより求めた。そして、抽出した限界距離を接近限界距離と定義し、各パーセンタイルに対する、接近限界距離のモデル式を策定した。%The act on Partial Revision of the Act on Port Regulations and the Maritime Traffic Safety Act was enforced on July 2010. It follows on this law, a vessel shall not overtake other vessels in the designated section of the Kurushima Traffic Route. And when current is adverse, a vessel shall navigate with a log speed of 4 knots and upwards. However, the congestion has occurred within the traffic mite by no passing. This situation has given to navigation officer load, and the dangerous situation has occurred. How to solve this problem, the marine traffic control according to a situation is required. That is, passing of small vessel is made possible. Then, the questionnaire was carried out about the distance which navigation officer seeds within the traffic route. From the result of the questionnaire, it was defined as Limit of Distance. And the new navigation control method was proposed. This research considered the safety navigation within the traffic route for a small vessel.
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