The issue is considered a major problem, accident, which create both economic losses. Society and quality of life. The relevant agencies have various measures to minimize accidents. But these problems do not reduce less addictive. In this research, presentation techniques, accident inspections in order to know the factors that impact accident. As a guide to improve road safety By using the technique of analyzing tree failures (Fault Tree Analysis) is a technique to help find the causes of accidents cause the official step by selecting the initial accident event, then the underlying cause analysis by ranking the causes of up.The tree is a tree. Point, then analyze the factors that result in the most sutdoika car, underlying cause of starvation, accidents, each comes out. Using this technique, but it still might not have enough in the analysis of factors affecting the accident because the preliminary events, there is no statistical information. Thus the opinions of the experts described the importance of each factor. By using the theory of vague (Fuzzy set Theory) will reduce the ambiguity caused by the opinions of the experts out come is characterized by a probability of factors affecting accidents. The application of analytical techniques in conjunction with failure tree theory of ambiguity will help find the cause of the accident or as guidelines for increasing road safety.
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