Abstract Summary
The present traffic safety measures appealed to the eyes,then they arent fully effective in some cases, like for drivers not looking ahead, hazy drivers and so on. On the other hand, drivers can unconsciously hear and can easily understand the meaning by the voice warning and the information provision. Then the auditory system can become the effective traffic safety measures because it can directly informs drivers. So, we developed the system which transmitted voice warning and voice information directly to all drivers at open section. And we installed this system in some expressway sites.
