Half a croissant, on a plate, with a sign in front of it saying '50c'
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Replace "light" with "sausages" and this may work...

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Traffic tips

Use flashers and send money with them
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It's common in some parts of the world to use one's flashers once or twice to say "thank you", as in for letting one's cat into traffic. I propose a communications protocol and add-on to give that "thank you" a little more weight.

The push of a button combined with the use of emergency flashers would tell a computer to read the license plate of the car behind. It would hash that with a bitcoin payment, which would be broadcast. Upon receiving a decryptable payment the other person's unit would accept it.

edit: it's funny and it stays.
Voice, Aug 17 2014

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       So, I'm going to tip someone for letting me in from a side road? The value of letting me in from a side road is, very roughly, one thankyou.
MaxwellBuchanan, Aug 17 2014
  

       how about a thank you and 1/10th of a cent in bitcoin?
Voice, Aug 17 2014
  

       Nah.
MaxwellBuchanan, Aug 17 2014
  

       [+] though history suggests that initially most users (by dollar amount) would be criminals laundering money
sninctown, Aug 17 2014
  
      
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