HMI Concerning Vehicle Infrastructure Cooperative Systems

Vehicle-to-infrastructure cooperative systems have been shown to help reduce accidents at intersections with traffic signals, and are now being developed in Japan in cooperation between the public and private sectors. Furthermore, to help expand the utilization of such systems, Toyota Motor Corporation is also developing a function to help reduce cases of delayed vehicle start when the driver fails to realize that a red signal has turned green. To achieve this system, in-vehicle tests have been carried out of a human-machine interface (HMI) that informs the driver of the remaining red signal time effectively and without inducing dangerous driving. This paper describes the required HMI characteristics for meeting the system requirements and the results of the in-vehicle tests. These results verified that the HMI had the targeted effect without inducing dangerous driving.