The real world is full of 'edge cases' that humans can deal with through their intuition and understanding of context. Humans are unlikely to mistake a yellow-ish moon for a yellow traffic light unless very intoxicated.

I'd like to see a Tesla on full autonomous autopilot take a drive in Calgary or Edmonton a few days after a heavy snow, when it's been mostly plowed but the lines are missing from the roads, all the lines at the side of the road are covered in snow, etc.