From my car on motorway A6 Luxembourg country , I was driving from west to east at average speed of 110 Km/hour and about 1 kilometer south of Luxembourg city. The weather was very cold ( -5°C) and the sky was dark blue crystal clear. UFO had Sharp borders and no tail. It was a deep black color and it was very visible due to backgrounded dark blue sky. It also has 3 average sized white lights and an average sized red light at the center. I would say 2 more blinking white light near the center of theTriangle. The side length is at least 100 meters. The flight was at a very low altitude and it flew straight from south to north going right above Luxembourg city. Our convention aircraft are not allowed to fly this path over Luxembourg. The object was almost right above me. The UFO Speed was quite slow. I didn’t notice any particular sound. I eventually lost sighting due to the motorway direction. I often use this motorway at about the same time every day . NOTE: The above image is a rendering.
