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Tunnel reduces travel time as and it is essential facil ities for the eco-friendly road construction. In recent years, It has been accelerating the tunnel construction to provide a higher level of traffic service but a driver driving in the narrow and dark tunnel takes characteristically psychological anxiety and the restriction of the sight. Moreover, A driver passing through more than 1,000m long tunnel, as to pass inside the monotonous form of the tunnel for a long time can cause drowsiness and increase the driver load. This driver load can degrade road-holding of the inside of the long tunnel highly and pose a high risk of accidents. Accordingly, In this s tudy is to present the proper length of the Tunnel, considering the characteristics of traffic accident. For this, this study is that the long tunnel that affects traffic safety traffic safety variables are selected and classified.Traffic safety variables are classified in detail as a variable of the traffic accident and velocity one, the applicable variab les the number of the traffic accident, the ratio of the traffic accident, driving velocity, the individual vehicle velocity etc. Traffic safe ty variables are categorized as more than a pole length of the tunnel in order to examine its impact on correlation analysis. The results indicate significant results in traffic accidents in accordance with traffic accidents, traffic safety, selects the variable was Variabl e depending on the length of the tunnel traffic safety point of significantly increasing the possibility of an accident can be seen as a high point. And the point of the Distribution of selected variables in order to create a traffic safety was a significant increase in traffic safet y variables was set at critical intervals. Before reaching the critical point and the corresponding length of the long tunnel was set at the pr oper length. In this study, the optimum length of the proposed long tunnel through the long tunnel that occur in the future to contribute to reducing traffic accidents would be able to be determined.Key words : Long tunnel, Traffic safety, Traffic accident, Design consistency, Correlation analysis             .           .              .  1,000m                 ,         .            .            .           .    ,   , , ,       .    Transportation Engineering

Suggestion on the Optimal Length of Long Tunnels Considering Traffic Safety Characteristics