The state police and cook county sheriff dept will sit on the entrance side of the expressway in both directions and have 1 squadtag you and call it to another squad thats sitting on the entrance ramp. They only go after speeders,but will nail you big time. They only seem to do this a couple times a month,so be on the lookout. Also,going westbound after medinah/meachem rd, they will sit behind partion and you wont see them untill you have blown past them.