I see what you mean. If you look at the main stream (https://www.youtube.com/watch?v=y-rzie9G0Tc) just as the brightness is coming back to normal in the early morning, I'd say it's a small street cleaning vehicle with a constant bluish-white light and flashing yellow lights.
https://www.youtube.com/watch?v=olCEuGOEDUI&feature=youtu.be
Here's another one.
I see what you mean. If you look at the main stream (https://www.youtube.com/watch?v=y-rzie9G0Tc) just as the brightness is coming back to normal in the early morning, I'd say it's a small street cleaning vehicle with a constant bluish-white light and flashing yellow lights.