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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
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.
[Wrongfellow, Oct 22 2018]
||"THIS SIGN INTENTIONALLY LEFT BLANK"
||WATER IS MADE BY EXPLOSIONS.