Yes, I consider myself friendly to strangers. As long as they seem to be someone who is receptive to conversation and speaking to a stranger, and aren't angry or obviously unapproachable, it's easy to speak to people. Even if they weren't friendly and it was obvious, I wouldn't be unfriendly, I just wouldn't strike up a conversation with that person. For me, being friendly to everyone is easy and even just a smile can make a big difference.
In the late 70s there was a TV commercial on, I don't even remember for what, but one of the lines was "smiles are friendmakers" or something to that effect. I will always remember that. : ) It can be true.