Rotary lights appear to light up but don't actually emit any light. I can't drive trucks with permanent light fixtures because this missing light physics breaks my brain.
If you're unsure what i'm talking about.
This is snowrunner.
This is gta5
Youtube Video – [01:53..]
Defiantly not perfect for a 7 year old game, but it just an example. Light cast on surroundings, self reflections and reflections on other vehicles.