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Being in traffic for my job, and having read the traffic 'bible', the MUTCD, many times, I'm not so certain that those 'night' signs are legally enforcable.

I'd have to look them up specifically, but for some reason, I recall reading something once about the requirement of speed limit signs that would make them invalid. It might have been something about it being Black Text on a white sign, rather than the reverse or something.

I'll look it up when I get back to the office today if I have time.
I may be completely remembering it wrong, but I'll do some additional investigation.