# Navigation Safety on Shipping Routes during Construction
## 5 Discussions and Conclusions
The improvement of navigation safety influences the reliability of maritime transport, which, in turn, affects the efficiency of transport chains performed using different transport modes. It should be highlighted that the presented calculations were carried out under specific assumptions. These assumptions dealt with set external conditions impacting the ship's movement inside the port and navigational channel, which were constant for the set time unit. Therefore, in order to apply the developed methodology in practice, calculations maybe carried out considering possible changes in external conditions. Importantly, trajectory calculations may be carried out on ships by masters or pilots who may use current data to modify the sailing route if needed. Moreover, the presented calculation model may form the basis for the software development that could be installed on ships and facilitate the decision-making process of ships' masters and pilots while trajectory planning to improve safe navigation during construction work in navigational channels, ports, and other areas. It should also be noted that research results are limited to selected case study analysis. The ship's movement within the navigational channel close to the approach to Klaipeda port during infrastructure reconstruction work was analyzed in detail. Applying the developed calculation method, it was possible to receive the dependence of passage widths on the size of the ships (lengths), as well as the dependence of distances between platform and ship passage bands on ship sizes under set hydro-meteorological conditions. These research results show the dependencies achieved for specific external conditions. Therefore, the calculations may be repeated for a selected case study but testing another set of conditions, including hydro-meteorological. Moreover, it may be reasonable to examine the possibility of applying the developed methodology in other external conditions, for example, considering ship navigation in the Fehmarn Belt strait during the construction work of an underwater tunnel. Research results may be interesting for shipping companies, ports, and maritime authorities involved in planning and performing ships traffic in different navigational conditions. Ship masters and navigators, as well as port pilots, must be educated and trained in advance to make them familiar with local special conditions and their influence on ships sailing trajectories and passage bands. These activities are needed to prepare them better for ship traffic planning before the start of construction work in ports and navigational channels. Moreover, the results of the analysis could be also beneficial for the operators of specific equipment taking part in the construction work in the port and navigational channels (e.g., cranes, platforms, etc.). The directions of our future research will focus on the further development of the presented methodology and conducting advanced investigations searching for ways to increase maritime transport safety and efficiency. Conceptualization, V.P. ; methodology, V.P., D.P. and L.F.-D.; software, V.P. ; validation, V.P., D.P. and L.F.-D.; formal analysis, V.P. ; investigation, V.P. ; resources, V.P. and D.P. ; data curation, V.P. ; writing--original draft preparation, V.P. and D.P. ; writing--review and editing, L.F.-D.; visualization, D.P. and L.F.-D.; supervision, V.P. ; project administration, V.P. ; funding acquisition, V.P. All authors have read and agreed to the published version of the manuscript. This research received no external funding. The APC was funded by Klaipeda University (Lithuania). Not applicable. The authors declare no conflict of interest. The funders had no role in the design of this study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.