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The system is likely capable of distinguishing a lit green light from a sign painted like one. If you're simply asking "would the system be fooled if someone nefariously hung an always green light where a red one should be" surely that is a circumstance that would fool a human as well.

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I'm not convinced it would distinguish the two.

Perhaps the most concerning thing is that someone could create a nefarious image that's not obviously nefarious to humans. I mean, we've all seen the very slight adjustments required to trick state-of-the-art image classification systems into thinking a cat is really a crocodile.

>The system is likely capable of distinguishing a lit green light from a sign painted like one.

I doubt it. It's not even clear that it shouldn't treat a painted green dot like a green light.

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