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I saw this in the UK and wondered if it's legal in the states - When you come to a quick stop all your lights in back flash 4 times (including your orange signal lights). Its a simple plug and play device you plug into your OBD port. With auto breaking it may prevent a rear end accident behind us.
https://www.youtube.com/watch?v=1nSG15hOGxI
https://www.youtube.com/watch?v=1nSG15hOGxI