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The only circumstances I've seen something like, is on the back of a pick-up truck. The plate hangs from the tailboard, so whether it's closed or open (as it would be if a longer load overhung the back of the bed), the plate is still vertical and readable from behind. Conceivably it could rise up to horizontal due to aerodynamics.
I don't think that's exactly what the OP saw though.
I've also seen plates where the white or yellow background colour is heavily black-tinted which I suspect is supposed to render them unreadable to a camera, though I wouldn't risk my licence to it actually working. |
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