The traffic accident increases because of an increase in the number of the car. The traffic safety measure on a soft side will become important in the future. Then, it focuses attention on traffic management as a traffic safety measure on a soft side in this research. It is thought that consideration to traffic of driver action influences the traffic accident. Then, the mechanism to taking a traffic action is clarified in this research. And, the purpose of a study is to understand the factor of the safe driving.