Large triangle craft passed overhead, rotated, turned 90 degrees to the right, and vanished.Driving East on NYS Rt. 5 in the town of Caledonia, New York, about a mile west of the Genesee river bridge at Avon, a triangle shaped craft, with lights all along the rear edge, passed over my car, heading in a northern direction, at about 500 ft above the ground. It was silent. I would estimate it was a little smaller than a 727 in size. It flipped (rotated right-to-left) at least a full turn over, did a instant 90 degree right turn, then vanished. No aircraft that I know of can maneuver like that.I served in the Navy, am an old sky diver, so I can tell height fairly well. This was something like I have never seen before, and it sent chills up my spine.The security guard where I work, told me the next day that some others driving into work had seen the same thing.