The car slipped suddenly on a snowy, left-curved road during driving in Tsuboana-chinai, Tainai-shi, Niigata Prefecture, Japan, after passing through the Kajigawa River flowing across the Route 7 National Road and through Sugatani on the way of the Route 290 National Road. Simultaneously, I turned the handle of the car right and tried to take a counteraction against the slip to nomalize the direction of the car, but unfortunately this action per se led to the impossibility of controlling the car. The car skated on the snowy road with a right-curved, tire-trail of approximately 30 m, and then clashed with the present guardrail.