Without detracting one jot from the selfishness and idiocy of the tailgater, I cannot but feel there is a slight touch of the kettle black in this episode. Unless of course it was some sort of remarkable voice-operated robotic smartphone ...
I don't think it was a smart phone. In the US some cars are now fitted with camera's to gather evidence in the case of an accident. I doubt, however if it was turned back by voice action.