People are Open on the Open Road

I've been thinking a lot lately about how some people are open and some are more closed. What prompted this were the number of times on the open road that I've had impromptu conversations with people. However, I'm not sure that it's that people are open or if the situation is open.

What is it about the open road that encourages that? It's not that you're all travelling because you're often talking to a local. Is it that I'm more open? Is it that I have a question I wouldn't have at home and that opens it up? Why is it that we can have this interaction with people on the road that we don't have at home?

It's something I'm pondering these days. I know I love being on the open road and that's one of the reasons.