Part of the problem is that the speed limits are often unrealistic and meaningless. The tollways around Chicago are posted at 65, but the speed in the left lanes is typically 80 to 85 (with the real cowboys even blazing past that). The state troopers rarely pull over anybody in the 75 to 80 range, which isn’t surprising, because the majority of the traffic is moving at that speed all across the tollway (if they can).
So all it takes is some moron in the left lane going 5 to 10 over the limit to disrupt traffic flow over an entire four lane width of highway - and of course since that bozo is running well over the limit, he’s totally self-righteous about sitting in the far left lane, even if there’s a half-mile gap between him and the person ahead of him in that lane.
My take on Chicago speeding is there are enough people doing 30 and 40 mph over the limit, they leave the people doing 10 to 20 over alone. There is a considerable jump in fines for doing 30 and 40 over. I want to say 30 over is $1500 fine. 40 over is $2500+ and jail.