Heading south on Cumberland (IL-171) after Irving Park road. One cop sits in the grass next to the forest or in the median and zaps anyone going down the road. Anyone caught going 5-10 or more over the limit of 35 is pulled over and ticketed by a chase car. Typical hours are Evening rush hour to Late evening. Enforcement occurs on most nights. Also if going North beware as the chase cars can zap you as well.