In recent, a lot of fatal crashes with serious damage in terms of fatality and cost have been occurred in tunnel areas of expressways, drawing a huge social concern. However, each countermeasure for the tunnels in which traffic accidents have been happened is different, and it doesn’t seem that it is a fundamental measure because there is no unified standard. This research aims the application of standardized and comprehensive countermeasures for the improvement of traffic flow condition and safety in tunnel areas, through the cooperation with the organizations which are in charge of traffic safety management in Tunnel areas on expressways. The main components are as follows; the first, the establishment of comprehensive countermeasures providing tunnel areas with more safe traveling environment, the second, the standardization of comprehensive countermeasures, the third, the cooperation with the organizations in charging of traffic safety for the establishment of a detailed plan.