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I brought a friend out to California, and she noticed that the freeways here had reflectors instead of painted lane markers. I told her that the reflectors were part of a sophisticated electronic system installed in some cars that allowed blind people to drive without causing accidents.
The reflectors told the car where the lanes were so that they wouldn’t swerve. A couple days later, she had a “Hey, wait a minute!” moment. Story credit: Reddit / archpope