What is that mirror like ball in the sky?

On the way home from work I traveled the expressway.And comming up over a rise in the road,I noticed a round cylindrical,metalic object that was smooyh and shiny! As I looked closer I noticed that there was what appeared to be rivets like that of skyscrappers use to hold girders together.Also that it had an orange/yellow color. When I went down the next hill to try and get closer for a better look it was gone. as Iapproached the area where I'd seen this thing I noticed that there were contruction vehicles parked in a field,backhoe's and things of that nature. All I could think was that whatever it was,was checking out our capability to construct large machinery. I mention to my family what I had seen and of course they thought me crazy! So when I found this site,decided to see if anyone else had seen anything like I had.Also I have to add that when it disappeared it happened so quickly like it kneww I was watching. I'm totally blown away by this incident,hopeing your organization can shed some like on this subject.