Investigation and analysis for traffic accidents caused by mechanical troubles of vehicles.

The increase of the number of vehicles has caused serious social problems, one of which is a traffic accident. It occurs mostly in and around the urban districts with the increase of the number of vehicles. The inprovement of the roads cannot catch up the rapid population concentration in the urban districts, which is causing an extremely heavy traffic and a traffic jam. in addition, due to the deficient road condition and inperfect education for traffic safety, most traffic accidents occur in and around the urban districts. There are various factors for traffic accidents, but the reporters limited their research to those accidents which were caused by a mechanical troubles of a vehicles, and they analize the type of accidents in terms of 1) model of vehicle (manufuctured date) , 2) driver's experience (length) , 3) driver's age, 4) time when accident occures , 5) model of vehicle) kind and manufactured company) , 6) use