I was talking to the guy I work with about the very same subject this afternoon.
He said that if he ever won the lottery, he was going to hire some screen time at Busch Stadium during halftime and post a slide show showing people exactly how to merge with oncoming traffic when using an interstate entry ramp....that you're supposed to use the ramp to get up to, or close to, the speed of the rest of the traffic on the freeway. It's not a place to trundle along at 35 mph, enjoying the scenery.
I said I'd like to explain to people how to operate a motor vehicle at a 4 way stop. Just because you came to a complete stop, does not mean that you can just merrily pull out into the intersection, ignoring all the cars that were there before you. You have to wait your turn...an concept seemingly alien to a bunch of people around here. It's a "i stopped so I'm gonna go" mentality, and some days it makes me want to get out of my car and beat on other people's windshields until they get the point.
I'd LOVE to have one of those scrolling text thingys in the back of my car. I'd probably get arrested for some of the stuff I'd be saying to people....