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Cars should have two horns. A polite one and one that is a fuck you horn
(literature.cafe)
Sometimes we have those little epiphanies in the shower.. sometimes they come from other places. This is a home for those epiphanies.
At this point, I think all cars should have an LED display for text. Flashing your lights can get people's attention, but it could mean anything. We should be able to set a message (maybe with a handful of defaults) to be displayed either on the front or rear of the vehicle. It can warn people that their light is out, or their trunk is open, or anything else. It'd clear up a lot of confusion.
"Hey Raider!" "Wanna team up?"