Spent the week on a similar trip. Had a semi nearly take me out moving into the left lane as I was coming up on him. It was close enough my wife gasped....he was obviously not patient with left lane cars anymore. I saw another do the same to another car, and then a couple trucks just staying in the left lane, but they had the hammer down.
Also noticed terrible lane control in town. People will turn right, into the left lane, or left into the right lane. That is a really bad idea!!!! It's bad here in my town, but I figured it was Iowan's driving badly. The Chicago Suburbs are not much better, though they at least use turn signals.
Any of you who do daily commutes in the Chicago suburbs, I tip my hat to you. I did it 2 days, and that was enough for me.