We have been researching the technology to reduce accidents by utilizing AI, 5G, and cellular V2X communication, aiming for the realization of a society where pedestrians and vehicles can move safely and securely. The system enables the AI of the cameras on board to detect a pedestrian entering a roadway, and to alert him or her to the approach of a vehicle by communication with the pedestrian’s smartphone. The system also enables each other to pay attention by identifying not only the areas that cannot be seen very well, due to the obstacles such as parked automobiles along roadways, but the presence of pedestrians in the area with a smartphone or the camera of the ongoing vehicle. In the future, various risks in the streets will be compiled into the server, and the technology will be expanded to the cooperative safety system that can encourage traffic participants to take action in advance to avoid risks.