Half a croissant, on a plate, with a sign in front of it saying '50c'
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too close for speed

send a high frequency sound to vehicle behind, get echo, determine safe following distance, based upon my speed.
  (+2, -1)
(+2, -1)
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Flash a light when following driver is too close.
jkreid, Feb 05 2004

Taking it a few steps further Range_2fSpeed-Diffe...de_20View_20Mirrors
Found this one via the random button [normzone, Mar 24 2010]

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       Baked, maybe not in sonar form.
yabba do yabba dabba, Feb 06 2004
  

       baked not only in multiple postings here but in multiple production cars including the one I drive.
theircompetitor, Feb 06 2004
  

       //Flash a light// Make it a blue light, leave it flashing as you slow down and pull over. Perhaps you can make a quick buck by writing fake tickets.
kbecker, Feb 06 2004
  

       Perhaps you could go to jail for writing fake tickets.
yabba do yabba dabba, Feb 09 2004
  

       Perhaps this is baked in the form of brake lights activated by an automous system driving a biomechanical actuator when its optical sensors detect said condition via rear view mirror.
half, Feb 09 2004
  

       Perhaps they are following closley intentionally.
Letsbuildafort, Feb 09 2004
  

       Perhaps it's the Publisher's Clearinghouse Prize Patrol trying to give you a check for One Million Dollars and you're going to scare them away.
half, Feb 09 2004
  

       Perhaps the next annotation won't start with perhaps.
oxen crossing, Feb 09 2004
  

       Maybe.
Letsbuildafort, Feb 09 2004
  

       Seems like an easy adaptation for cars that have "active cruise control" although that is based on radar instead of sonar.
DIYMatt, Mar 27 2010
  
      
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