This speed trap is normally done at dark in the early morning or late at night (when the bars close). When going out of town on north 4th street, police hide in the shadows on the opposite side of the street near Hill Street (on the south bound side of the street going into town). A large tree over hanging the street blocks the light from the street lights. You won’t see them until it’s too late. Slow down at the Rock River bridge and you should be fine. Speed limit is 25mph.