Half a croissant, on a plate, with a sign in front of it saying '50c'
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Motorway Sign University

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Motorways are equipped with various configurable signs on overhead gantries. Some of these signs are single-colour and designed to display simple text messages ("Fog Ahead - Slow Down"; "Lane closed ahead"; "Whelk on Sliproad" etc). Others are a little more complex and can display black-red-and-white road signs such as temporary speed limits.

Most the time, these displays sit there blankly staring at oncoming traffic because there is no fog and no whelks. What a waste!

Instead, therefore, why not use idle signage to display basic but useful facts. For example "Human Genome: 3e9 bases", or "Prime numbers are indivisbible", or "Deimos, Phobos: moons of Mars". Facts can be updated every few hours.

MaxwellBuchanan, Oct 22 2018

Prior art? https://imgur.com/gallery/65bsF
[Wrongfellow, Oct 22 2018]

[link]






       "THIS SIGN INTENTIONALLY LEFT BLANK"
8th of 7, Oct 22 2018
  

       WATER IS MADE BY EXPLOSIONS.
RayfordSteele, Nov 05 2018
  
      
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