Large underside of enormous object, blueish lights - seeming complex intricate industrial looking undercarriage

Riding home from a school event with my parents, presumably my sister in the car with us. We were in a lot of traffic at this location (traffic from school event, play perhaps?) someone in the car said "what the heck is that above us?" and we all looked out of the windows up. I don't know if the shape was rectangular because it may have been too big to see the overall shape. It looked like a somewhat complex undercarriage of something industrial - like piping and things all over it (again just the underneath view). It was many years ago so my recollection isn't perfect but I have the impression that there were bluish straght lights and some yellowish-white lights illuminating the pipes, almost as if the lights were long - not super glaringly bright.
We all couldn't explain it - many, many other people must have seen it since we were all sitting in slow traffic and there were people outside walking around as well. The date isn't exact but somewhere in that range - the location taken from google maps is exact.
I don't remember if anyone did anything with it. I would presume my mom or somebody called the police to let them know once we got home but can't be sure.