Although the number of deaths due to road accidents are decreasing, the rate of decrease is diminishing gradually during recent years, and the rate of accidents among elderly drivers is particularly high. Therefore, in this paper, in order to make clear the driving characteristics of elderly drivers, a survey was conducted on 6,298 drivers in Japan and 430 drivers who have participated in a traffic safety lesson in Kanagawa Prefecture, and analyzed using such methods as a decision tree. As a result, various points were clarified, such as the fact that the number of driving offenses and accidents among elderlies who realize that their senses are deteriorating and the rate of accidents resulting in injury or death caused by elderlies who drive moderately are low, and that elderlies who are embarrassed of causing an accident avoid driving.
