There is a feature in GP4 called atx_flag that allows us to use some sequences of images to create a certain movement in static objects.
I quickly made examples just to illustrate some possibilities:
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See the Rolex baneer, Safety Car lights and flashing green lights at the exit of the pit lane.
The same principle I used to animate the flags at the entrance to the Interlagos 2019 pit lane.
In this reasoning, other objects can be animated: flags, trees, vegetation, video monitors in garages and pit gantry, people walking, marshalls or fireworks, as seen on the Singapore track.
These are some possibilities (still) that GP4 unbelievably provides us and can greatly improve the immersion experiences in the game.