<正>Traffic separation schemes along with Vessel Traffic Services (VTS) have significantly improved the existing safety standards within restricted areas. The VTS is any service designed to improve safety and efficiency of traffic and protection of the environment. It may range from the provision of simple information messages to extensive management of traffic within a port or waterways.Since its aim is clearly defined one can put a question of possible development. Primarily traffic services are to be more active and scientific background of its activity should be more deeply explored. Passage recommendation and selection of routes are within a scope of interest of each traffic operator. It is assumed that computerized decision support tools will be widely used. This paper is devoted to upgrading hierarchy among available options whenever decisions regarding route selection or routes assignment are considered. Multi-objective approach is presented in context of choosing the best passage for a single vessel. An idea of traffic control within restricted waters is also included. Decision-making as a process is briefly discussed.