Object was at tree level, approximately 200 feet in diameter and made no noise.

I was approaching the Dexter, NY airport early in the morning on my way to work.  It was dark.  From about a mile away I saw a bright light at the airport.  I passed it off as just being the beacon.  When I got closer I was shocked to see that there were two separate sources of light, one being the beacon and the other being unidentified. When I got to the precise area where the light was, which was about 1/4 mile from the airport beacon, I saw the object producing the light.  It was about 100 yards away from me at a position just above the tree tops.  I had a very good view of the craft.  I exited my truck and stood at the side of the road observing it for approximately 1 minute.  It was saucer shaped but had flat sides which did not come to a point. It was approximately 200 feet in diameter and had bright lights around its peerimeter and on to and bottom.  The lights varied in color from green to blue to white. It made absolutely no noise.  As I watched it I made a decision to leave the road to attempt to get underneath the craft as it was only 100 yards away.  I heard a vehicle coming down the road and looked in that direction to see if they were going to obvserve the object and slow down or stop.  I was only looking in that direction for a second or two and when I turned my head to watch the object again, it was gone.  It had made no noise at any time.  As I forgot to mention its height, which was about  20 to 30 feet.