UFO Sighting in Pell City, Alabama on October 21st 2015 – 80 ft long black cylinder

I was driving East on I-20 just west of Pell City, AL. I noticed a large black object hovering over the interstate. I whipped out my camera and tried to record it. I estimate the object to be around 80' long and approx 300' off of the deck. I observed it for about 2 miles of interstate before passing underneath it. I could not see any windows or features to the object, and it appeared stationary. My wife was traveling less than ten minutes behind me and was not able to positively ID the object, as it had moved away by then. I looked at what I had recorded and did a screen grab of the object zoomed in. I will attach both files. Unfortunately, the video makes it appear much smaller than what I was observing. Anyways, I don't know what it was, thought maybe you would be interested.