Some years ago, I was driving home near Sheffield with my wife at night. I noticed a white light very high in the sky. I pulled up and we watched for about 10 minutes. It started moving fairly fast then suddenly did a sharp 90 degree turn and flew out of sight. When I say sharp, I mean like a fly, instantly changes direction. It took us a few minutes to come to terms with what we saw and continue home.
Was it a UFO? I don’t know but I cannot think of any craft we have that can maneuver like that. -Trevor