I really love the car distance sensors. where I shows how close you are when backing in, or going out. when it turns red at 25cm (12 inches), I would really like to have a beep , as a couple of times I have almost sideswiped another car looking behind but not sideways. the only thing is that it might be too noisy. what are peoples thoughts on this. have you scraped your car or a mall pillar and could have used it?