Half a croissant, on a plate, with a sign in front of it saying '50c'
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Personalized Keep Back Sign

Digital display on back of the car, tells the driver behind to keep back.
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Basically an e-ink bumper sticker, with a camera equipped which would take a pic and read your license plate. And give a personalized message, when a car behind you approaches too close. "Hey idiot with plate # BED-234, back off"
romanmar, Dec 09 2005

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       It might need some more AI than that, most people are unaware of their license number.   

       "Hey, red nissan with the dented right fender, back off!"
normzone, Dec 09 2005
  

       with even better AI! We can add other checks too, provide more messages,e.g. "And fix those teeth too!"
romanmar, Dec 09 2005
  
      
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