Collective Trust

It occurred to me today as I was driving down Main street how much trust we put in each other as members of a society.  I was in the middle lane as two cars merged into the the lanes on each side of me at the same time.  The only thing that kept me from freaking out was the fact that there were dotted lines on each side of me to keep me "safe".   I find it incredibly interesting that we operate these pieces of machinery that weigh at least a ton each, and the only reason we expect to not be killed by each other is because we trust that others will obey rules that tell us to stay within certain lines, and to use blinkers when change lanes. Just a random though that I had...