The present thesis investigates calculation procedures of the required widening of road pavement in curves of short radius. The aim was firstly to examine and compare some of the existing Directives, furthermore, to develop a common methodology, leading to a solution with optimal combination of security, functionality and low construction cost. Through the implementation of the existing Directives, using common design data, relative variation appeared in the results, especially in small radii

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... curvature, and convergence as the radius increased. In order to develop specific widening calculation methodology, special computer software Vehicle Turn (VT) was created. VT was based on the simulation of vehicle movement on simple curve or maneuver. The graphical environment on which VT ran was designed with the computer software H12. After comparing the results produced by VT with those from the application of Greek directives OMOE -X, relative oversizing by OMOE was observed in small radii of curvature and undersizing in large radii. This confirms the need of development of additional methods of approach to the existing Directives, including simulation.