There is a small electrical building on your left as you drive north on Arlington Heights Road just between a High School and Elementary School. The posted Speed Limit is 25mph on school days when children are present (whatever that means) and 35mph otherwise. The cop will sit in this little one car parking lot for this electrical building and catch people speeding. Also on this same stretch of road I have seen numerous police cars driving on it and suddenly stopping and doing u-turns to chase people over the speed limit. There have been many times where a group of cars has been forced to follow a police car going the same direction as them and the cops do not follow the 25mph speed limit, so how can they enforce it? Just be careful here…