South bound on 294 in between I57 and 159th street 4:00 a.m. Photo enforcement shooting south bound traffic. There was a sign posting Speed Zone and 300 feet beyond was marked 45mph. This cop was doing selected photo enforcement he was 150 feet just past the speed zone my speedo read 55 and the marker on the back of the Van was posting 60 other cars where doing 60 and he wasn`t taking photos he was very slective on who he was ticketing. I got turned around and he had moved after I made the comment at the toll booth about not having a chance to slow down and that he was way before the contruction zone. See any photo type flashes going off down the road it’s the IL State Police.