an idea for startup - a flat screen mounted on the back of your car and a rear looking AI. Once it recognizes say Tesla behind you, it will display on the screen an image which is known to be successfully recognized by Tesla, so it wouldn't rear-end you. Of course it isn't limited to Tesla. Also there is very good business case for subscription as Tesla and the others update their autonomous AI, the users would need updates to that anti-rear-ending software.