Half a croissant, on a plate, with a sign in front of it saying '50c'
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Automatic Collision Avoidance Horn

 Simpler than an automatic braking system.
  (+4)
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Radar senses when a car is approaching too quickly, closing within the parameters of a collision, and the horn is activated alerting both drivers of the potential collision allowing the rear driver more time to hit their brakes.

Easily retrofittable, you could buy a pair of these and strap them to the front and back of your car. A simple, relatively cheap solution that could prevent a lot of rear end collisions.

—doctorremulac3, Oct 01 2016

Cairo traffic https://www.youtube...watch?v=GnzxMjrBCTQ
[not_morrison_rm, Oct 02 2016]

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       Bonus if the horn noise comes from the cell phone -- it's about the only thing drivers pay much attention to these days.
—whatrock, Oct 01 2016
   

       Sort of like Cairo, nobody indicates,just beeping the horn all the time...
—not_morrison_rm, Oct 02 2016
   

       Yea, to keep this from being just a bunch of noisemakers on the street, there would be a very precisely adjusted trigger point.   

       The horn would sound just before the pint when the current closing rate will cause a collision with the approaching car in the front or back if brakes aren't applied within the second or so reaction time needed from when a driver hears the horn.   

       So there would be an x y graph of when the horn sounds. x being speed, y being distance between cars. Also there would be no sounding of horns below a certain speed, say 15 miles per hour such as during heavy traffic jams.
—doctorremulac3, Oct 02 2016
   

       //The horn would sound just before the pint // Now that would be a useful innovation.
—MaxwellBuchanan, Oct 02 2016
   


 

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