You only see these every so often, and they are always high up. There is no other markings on the sign, just horizontal black stripes of varying thicknesses like a bar code (no numbers though)
Answers:
Oooh don't know. Is it Big Bro?
It's Tesco's! they're selling everything now!
Are the signs you've seen near rivers? We have a strange thing high up, though I cannot make out real lines on it. It looks similar to a solar panel, but is blackish. Apparently, ours is a flood warning device.
jplannin permissions, so no one can read them so no one can object. usually.
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