Abstract The fast-paced and dynamic lifestyle of the modern world, continuous development, as well as facing various challenges, lead to increasing burden on infrastructure facilities. Designing new road infrastructure requires precise planning and optimization. The selection of a road route variant is crucial in the planning process. When choosing the optimal road variant, simplified spatial models are often used to compare various alternatives. This thesis presents the use of GIS technology to create a spatial model and select the optimal road route variant, including the possibility of determining the optimal corridor and optimal path. Initially, the assessment of environmental impacts is defined, along with the purpose, goals, and content of environmental protection in the road planning process. GIS, its utilization, and fundamental system, data, and model characteristics are also described. Subsequently, the user interface of ArcGIS Pro is introduced, along with its capabilities compared to those offered by ArcMap. It describes in detail the workflow with ArcGIS Pro and the use of the program's main functionalities in selecting the road route variant for both vector and raster data models. Using the example of the Kostanjevica na Krki area, the route variants of the already constructed Kostanjevica bypass road are analyzed. The variants are analyzed based on available vector data of the natural and cultural heritage of the studied area, assessed components, and identified environmental vulnerabilities. The selected variant has the least impact on environment. Finally, using a raster model, the area of the optimal corridor and route alignment is determined.
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