This master's thesis addresses the spatial placement, capacity and safety analysis, and conceptual design of a new highway interchange in the Postojna area. The aim of the study was to prepare a comprehensive professional assessment of three different design alternatives for the interchange. Two of the alternatives were developed as independent solutions, while the third was designed as a combination of the first two. The research began with the spatial integration of the proposed alternatives, considering spatial constraints, existing infrastructure, and the developmental characteristics of the area. This was followed by an analysis of the existing traffic conditions, which confirmed the presence of traffic-related issues, particularly in cases of extraordinary events on the motorway network, when traffic is diverted to the parallel road network. The findings confirmed the relevance and justification of the selected research topic. The capacity analysis was conducted using the microscopic traffic simulation software PTV Vissim, which was applied to evaluate the level of service and the impact of each alternative on the overall traffic performance of the network. The safety analysis was carried out using the Surrogate Safety Assessment Model (SSAM), followed by the conceptual design of the proposed alternatives. In the final part of the thesis, the alternatives were systematically compared based on the established criteria, and the optimal solution to the identified traffic problem was selected.
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