US Patent 7304589 Vehicle-to-vehicle communication device and method of controlling the same

A vehicle-to-vehicle communication device installed on a subject vehicle includes a detection function, a transmission function, a report function and a signal-processing function to display position information of surrounding vehicles as well as the subject vehicle. In a process of displaying the position information of the vehicles, the device communicates with the devices installed on other vehicles within a reach of the communication function to reflect the position information of the surrounding vehicles including vehicles not equipped with the device.