My other reason for not liking this push button idea... you only have 100% attention to pay... and if you're giving 15% of your attention to the rear view mirror, 30% of your attention to keeping the car in a straight line, 25% of your attention to keeping your car in the proper RPM range, downshifting, etc... 25% of your attention to traffic around you, and 5% of your attention to making sure you are going to be slowed down and stopped in time, while giving yourself enough reaction time to maneuver if necessary, then you try to spend another 10% of your attention to make sure you hit that button every time you notice that someone is behind you while you're slowing down, so that they can more easily tell that you're slowing down, and don't hit you, well, you're now using 105% of your attention, and you're not the US government.. you don't work on credit.
Maybe just a bumper sticker?
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