The white crossing indicator lead to a hilarious situation for me once. I am colorblind and always assumed the walking guy is green just like car signals. One day when a person I was hosting from Indonesia was walking in downtown San Francisco with me, we were talking about traffic conventions. He said to me “Here things are very easy. You just wait for the white man and then you cross!” I thought he was making an poor-taste joke about following the locals when traveling, and it took quite a while to clear everything up! And I learned something new about my own country’s traffic signals.