On I-94 all day long lately the Illiois State Police have been working in small groups of marked squads and unmarked. One Trooper stands outside the squad and uses the lidar (or laser) and then he/she gives the speed and distance that the vehicles are traveling to the other Troopers. Then they nail you! I travel this way every day and they have been in the areas between mile post 53.0 (Lakecook rd) all the way up to the toll plaza #21. They can sit out in the open on either shoulder because by the time you can see they are a squad car, they already have you with the laser. Watch out!