North Aurora, Illinois Speed Traps

Directly across from River Oaks apartments on Rt. 31 (between Oak and Mooseheart, or 1.5 miles south of I88) the North Aurora police will line up on Maple st. with a speed gun. It is 30mph there for a time, and they often line up with 1-3 cars and a gun (like a fun afternoon event) in the afternoon, and evenings.
I would hate to be the people who live on Maple st. and have to watch the cops sit in front of their house on a side street all afternoon!