Well I'm originally from the Chicago suburbs. So much for "midwestern values" and such. I have personally seen dozens of incidents of so-called "road rage" on the Chicagoland expressways.
The last time I drove back (in a rented POS Chevy), I was basically assaulted by some lunatic in a late model Bimmer. I have no idea what I could possibly have done to raise this jerk's interest, as I was just motoring along with traffic (75mph) in the middle-right lane of I-90/94 near Comiskey Park, maintaining a normal following distance behind someone else, but he insisted on cutting across three lanes of traffic in order to jam on his brakes in front of me. I move over into the far right lane to avoid this nutcase, and he keeps going at it, over and over.
I do not understand what is with some people. I also have not seen such intense hostility on other city's roadways (although I've had a couple bad experiences in Tampa - again with Illinois drivers!!)
The horrible traffic (full highways) plus an apparent abundance of these idiots, along with the weather, were big reasons why I left the Windy City about 15 years ago. I see things haven't changed that much. I don't think could go back.
Yes I realize I live in NJ now, and there's gotta be a million horror stories on the GSP & NJ Tpke, but I avoid those highways too.
My advice for dealing with these people is slow down and move on with life. Some of these psychos appear ready and willing to kill bikers. If you get a bozo like the one described on the original post, find a way to pull off the highway. Just stay alive!
Ride safe & live another day to ride again.