Wait, is this a UFO/UAP?

While riding home in my car I saw a bright white light passing by at my left side. Because I could not tell what it was, I started recording it.
Video is uncut. After I stopped the car the light varied in brightness and after a while it dimmed and disappeared when moving to the left. Then it re-appeared and keeps moving and it occasionally disappeared and re-appeared. When you look closely in the last part you can somewhat see its shape.
For me, although having reasonable knowledge about aircraft as a former aircraft maintenance mechanic, and having flown with all kinds of little aircraft days myself with my dad back in the days, I am not able to explain what I saw.
I am sure somebody can tell me what I saw that day. Leave a comment!