Do We Really Want to Know?

While waiting for the light to change at the intersection of Rt. 1 and Rt. 630 in Safford Courthouse (The large brick building in the background) I noticed this small roughly 5' x 5' structure. Then I noticed the sign inside, "No Trespassing After Dark Except on County Business." What kind of business would be conducted in such a structure? And why would the county wait till after dark to conduct what ever business that may be? I've call a friend of mine of the Stafford Board of Supervisors on this one and am awaiting a response.