As I drove away I tried to figure out why it didn't matter to her that the light was green. And I realized that people started teaching me the red=stop/green=go binary 12 or 13 years before I was ever expected to drive anywhere.
There was Sesame Street. There was the rule following race game Red light, Green light, which has no lights and no colors, but the concept of red or green dictates what the players can do. And in first grade there was a multi pocketed wall hanging where each student had 3 cards. At the start of the day everyone had a red card in back, a yellow card in the middle, and a green card displayed in front. The green card would get shuffled to the back if you did anything wrong, meaning you had a yellow warning, and if you did another thing wrong the yellow card got moved to the back also and you got a red card phone call home.
That green means go is not something I think about, but it's extremely deeply ingrained. I don't want to ever patronize Xiaona but I want to help and she seemed interested in the idea of walking around downtown with me, getting her bearings.