Which way do you go?

When you're driving somewhere and you come to a fork in the road, what do you do? For me, if I clearly know where I'm going, like when I come to the fork in the road that leads to my parent's house, I choose the road the is familiar to me. I choose the road that takes me to my destination the quickest. However, if it is a road that is unfamiliar to me, I look for road signs or follow the directions of my GPS to get me to my destination. So how do we know the right path [...]