Currently, the problem of the traffic incident, increased both the quantity and the violence in Thailand for an accident on the road is the cause of death and disability injury higher every year at a rate Ajarn, 18.4, 20.9 population and 20.5 per thousand in the year B.E.2541 - 2544 the cause of accidents on the road, many scholars have studied the cause of an accident in the 2 main reasons are caused by the actions that are not secure, including behavior that may cause an accident, such asinaction violates the rules and regulations, etc. , and is caused by the state is not safe environment that may cause an accident, it is not enough light is damaged, such as road curves.road vehicles are the roads and the environment, preventing accidents in the land traffic, it must solve the cause of the problem by focusing on 3 main factors, education, knowledge about the traffic.The control panel shall be in accordance with the law and the revised structural engineering traffic
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