This is a really useful idea and gives useful more fine-grained information without compromising the overall message: "I'm slowing down." Along a similar vein,

This is a really useful idea and gives useful more fine-grained information without compromising the overall message: "I'm slowing down." Along a similar vein, I want car horns to be as loud inside a car as they are outside, to ensure they're only used for emergencies. I live in a city and car horns dramatically reduce quality of life because "no honking, $350 penalty" are never actually enforced by the police.