allright maybe i asusumed its multiplayer. Much better if its not.
As mentioned you don’t have to show 50k particles its just a waste of performance also just a distraction for player.
Just show closest 15 cars data as particle
make an indicator right showing how many ahead
make an indicator left showing how many behind (besides 15 particle)
I wouldn’t have done this with niagara just use an UMG UserWidget. It would be easier to access each subwidgets data distance etc.
goodluck