I see it more of a system to make you more aware to things that matter, much like those vital road signs, its their way to contribute to a safer and more aware driver.I don't like my car telling me what to do. I suppose it might be nice if the speed limit changes suddenly, or maybe you don't realize you are in a school zone, but generally I know that I'm speeding and am choosing to. (Not that I do that often).
Has to be some way to turn it on/off I hope, some folks might render it useless or unnecessary.