The history of the automobile's progress is one of harmony with society. Automobiles have progressed by applying to the maximum degree the available technologies of each era and seeking harmony between social needs, the needs of consumers and the state of road system development. The most critical and lasting issues in the automobile world will continue to be safety, the wise use of natural resources and protection of the environment. While it is necessary for automobiles to make their own contribution to the solution of these issues, it is also vital that automobiles be developed as a part of a total system in harmony with public investment, such as road facilities. In particular, it is necessary that a radio communications link between automobiles and a traffic control network be introduced to enable driving that is safe, efficient and in good harmony with the environment. In order to overcome these problems, it is necessary to actively engage in information and technology exchanges that transcend national boundaries and the bounds of technical specialties, and at the same time introduce a wide range of advanced technologies.