We were on the highway, I only watched it from the time we spotted it up ahead until it was too far behind me to see. It was to the right, so the person in the passenger seat and the person in the back middle saw it. They actually spotted it first and pointed it out to me. We were all in agreement that it was like nothing we've ever seen. It never moved rapidly. It sat in place for about a minute, then started moving forward. It's movements were slow and very smooth.