Huge circular something crosses I 295 on 10/24/12 at 16:14.This afternoon while traveling North bound on interstate 295 something caught my eye in my peripheral vision. I was at approximately mile post 28 near the Richmond Airport. It was 4:14 pm. A perfectly clear, sunny day with a gorgeous blue sky. I assumed it was an airplane and turned for a quick look. It is thrilling to watch the big jets cross over the highway. Except this was not a jet. It was round and silver/white like a perfect mylar balloon with absolutely no markings. It was very large and was only about 200 feet above the ground. I looked at the car next to me and as the driver passed me and saw it he pulled hard right across two lanes of traffic and stopped on the shoulder of the highway. I slowed way down and watched as the circle dropped to about tree height and held position. As I got closer I was anxious about driving by it but before I reached it, it pulled up a bit and quickly crossed the highway and dropped behind the trees quite rapi! dly. The most disturbing vision was of the undeniably huge circular shadow it cast and watching that shadow move across the highway in front of me. At least two other cars pulled over and watched. I was too afraid to stop. I have been trying to explain this away to myself and others since it happened but that shadow refuses to tuck itself away in my mind.