Obviously. But you can also easily look around at the situation and know when the sign is fake and realize it may be a dangerous situation and disobey. Have you ever seen a green sign that says "Proceed" and just run through a red light because of it? No, you see a construction worker, you see big ass trucks, orange signs and warnings of workers everywhere. If you saw oncoming traffic and people in the road, would you just go because the construction worker flipped his STOP sign around?

Also, I thought we were supposed to make autonomous cars better than humans? What's with the constant excusing of the computer because people suck?

These aren’t tests against autonomous cars though these are tests against what would happen if you used, say, gpt4o to figure out what to do.