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The most famous traffic survey in Slovakia is national counting of traffic which is performed since 1963 and in periodical five-year intervals since 1980. It is very extensive traffic survey focused on traffic volume on all sections of highways, speedways, roads of first and second category and selected sections of roads of third category. A lot of other traffic surveys are also performed with different purposes. A special traffic survey has to be carried out before its put in operation due to working out of road tunnel safety documentation, especially due to risk analysis to determinate road tunnel category in regard of dangerous goods transport.