What was this guy thinking?

This story is compliments of a very good friend of mine. He drives a tractor trailer. He was driving down the highway and a little pick up truck started drifting over towards his front bumper. He looked at the guy and realized the driver of the pick up had the cell phone in one hand and was typing on his laptop with the other hand. The guy was also using the hand with the cell phone to write stuff down on a piece of paper on the steering wheel! My friend layed on the air horn to keep the guy from hitting the bumper and the pick up swerved across three lanes of traffic. I would hope that the guy decided to put everything down and concentrate on driving but I do not know if he was smart enough to figure that out. After all shouldn't he have thought of that before he almost hit a tractor trailer!! This just goes to show there are all kinds of drivers out there, please be careful.