This is my experience as well: openness scales with trip distance. If you're on the subway, you're probably just trying to get yourself to work, probably stres

This is my experience as well: openness scales with trip distance. If you're on the subway, you're probably just trying to get yourself to work, probably stressed out, lots of creeps and weirdos, etc. Get on the train, don't bother anyone, get out of each other's way, get off the train at your stop. Whereas on Amtrak (and to a lesser extent buses) I've struck up conversations with people and had people strike up conversations with me. There's something psychologically different about being settled in one place for a while, as opposed to in a situation where everyone is up and moving and rushing past each other.