Imagine driving down the road and seeing a large tractor trailer a few hundred feet in front of you. As you approach the truck, everything seems normal. You start to pass it on the left, and you think nothing of it. And then, all of a sudden, that truck starts merging into your lane without showing a glimmer of understanding that you are right there. An accident ensues, and you suffer terrible injuries as a result of the crash - and yet that makes you one of the lucky ones.