The fairway within the area of Yul-do and Songdo located near the Myeongnyang-sudo approaches south of Mokpo harbor is well guided by Traffic Separation Scheme and other navigational aids. However, that part of the waterways where Yul-do is located sits at the cross-roads of marine traffic. Furthermore, the area is subjected to some potential risks in the navigation: the effect of climatic phenomenon, the disregard of most ships in using the western sector of the fairway creating a congestion in the eastern sector, and lastly, the disadvantageous effect of the location and height of Yul-do island that hinders good lookout. This is the object of this study and it aims to propose an improvement on the use of the traffic lanes to make it safe and an efficient guide to the navigation in the waterways. This study shall investigate the environmental conditions that prevailed in the area in the span of 5-year period and marine traffic situation taken from the data within the 72-hour period. The navigational hazards and marine casualties shall also be presented. The results shall be analyzed and will be the basis of a proposal for an improved separation of traffic. Thereafter, an evaluation shall be carried out by using the components of marine traffic flow simulation and ES modeling index. It shall be evaluated through simulation by the use of Full-Mission Ship Handling simulator.