I think this is a misunderstanding that this feature is for reminding you're speeding. It's a quite unintrusive, small symbol that informs you if you forgot or missed the actual speed limit.
I often go on the autobahn with cruise control set to 130mph/210kph very late or very early in the day, thus there's little traffic. Sometimes there are short intersections with speed limit for no obvious reason and it happens that I - with my mind focused on the road - miss the traffic signs and find myself unintentionally going 60mph too fast or simply asking myself if there actually is (or isn't) a speed limit right now. I definitively want this feature in my next car.
Edit: I'm usually alone in my car, but if my wife and kid are with me, it's useless to ask her, she woudn't know the speed limit either. However, she's nagging me for my speeding anyway.
