How much discipline does it take to stand waiting for the light to change green?
This is a complex question when you live in a busy city and is something I have no resort to play with when I notice our accountability fading.
Of course this isn't astrophysics but it is something that is very difficult to do. There are too many people stepping past you and edging closer and closer into the street. What do you think is telling you to follow them? You or your body? I'm no expert but it just seems interesting when you are trying to become visible, and later find yourself trying to make more individually commanding decsions and we haven't developed crossing the street yet.