The present study analyses the three most frequent forms of the injuries of the upper layer of forest roads: pot holes, erosion grooves and damaged wear out layer as to the longitudinal forest road's slope. Pot holes occur only in the roads of up to 3% longitudinal slope, erosion grooves and damaged wear out layer, however, occur independently of the longitudinal slope of a forest road depending on correctly built in catch drains in the studied sector of a forest road.
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