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Actually, Some semi trucks have backup lights that they can flick on while driving. Had one flash them to me once to signal something (a thank you I think, it was a while ago).
Might cause problems with the law if you mount lights just to blind people behind you, but what cop would pull you over, unless you blinded them, but they can't see!
What I have been thinking about is a mirror to reflect their lights back to them, I followed my dad once and he had his mirror adjusted way out and my lights reflected back and was blinding myself.... on dims! The worst part was that it was flashing on/off with every bump.
I had an idea of a LED sign, but figured I would be tempted to abuse it.
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