DOIAbstract
The heavy rain which swept over the Nagasaki districts on 23 July 1982, killed 299 persons and damaged so seriously to Nagasaki city and its vicinity. Roads of Nagasaki city were submerged by flash flood. About 20000 cars were washed away by the flood and let along everywhere. About 20 car drivers were assumed to be killed due to washing away and landslides of roads. This car disaster due to heavy rain fall happened first time in our country. It seems important problems for car disaster prevention are presented.In the present work. car disaster is investigated by interviews and questionnaire for drivers and car engineers. Damage for cars due to flood and driver behavior are clarified and car disaster prevention is shown
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