Low flying triangle craft with red, white, blue flashing light on corners.

My Fiancé and I were traveling north west toward Asheville, North Carolina. I saw a craft that was flying slowly in our direction following the edge of the interstate. Traffic was very heavy at the time and we were barely moving and were able to see it very clearly. My fiancé kept saying that it must be an airplane and I kept telling her that it was moving way too slow to be an airplane. As it kept getting closer it became obvious to her that it was not an airplane, so she thought it may be a drone. Then as it got even closer it turned and you could see clearly that it was a large triangle shaped object and at that point her mind was blown and she was fully convinced that it had to be some type of UFO. I was able to take a picture on my cell phone that has a live short video feed. The craziest thing is that there was a spiracle blue ball following in front of it but kept changing shapes that we did not see with the naked eye, but is visible in the picture/short live video.