Given how bad human drivers already are, I wouldn't be surprised if there are lots of ways to fool them that don't fool the machines. Speaking from experience, having used Tesla's "Supervised FSD" v12.3.6, which is far from perfect, I've been surprised by how often it picks up things (signs, cars, pedestrians, etc.) that I have missed on the road. AFAIK, no one is laboring to find how to fool human drivers into misreading road signs.