I was driving back from Fort Collins, Colorado to Cheyenne, Wyoming on I-25 with my buddy. On the outskirts of town (approx 5 to 10 miles south of Cheyenne) I saw three lights which I first thought to be a C130. It was coming south and started to bank towards the east. I saw it rotate approximtely 90 degrees such that a plane (let alone a large one) could not sustain lift.I immediately thought whatever it was, it was going crash. At that point the lights were straight vertical, 3 lights up and down. It started coming towards as we drove on the interstate northbound. I started to notice as it got closer that it was not a plane. I could not really see any structure. This may have been because the lights were bright, because I was driving, or because it did not have any. As it got closer to us it turned more horizontally (lights maybe 45 degrees or more) and started coming towards my truck that was travelling approximately 75 mph. My buddy started yelling at me to hit the gas pedal because we thought it was coming at us and would crash into the interstate. Eventually the lights slowed down and whatever it was, was directly above my truck roof (which is opaque, no sunroof or anything). I rolled down my window and stuck my head out to see if I could see it in the rear but my view was obstructed and I do not think anything was visible.