I recently made a racetrack, and z-fighting is annoying my eyes. I COULD union it, but I don’t know if it would corrupt. Track is made of concrete.
I really don’t see any other options except for Union or if you want, make this whole race track in blender as a single mesh. 
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What some builders do is offset the problem parts by 0.01 studs or some other tiny number in the y direction, but you should be careful with where you do it because it is sometimes noticeable. Not nearly as noticeable as z-fighting though
I wouldn’t worry about z-fighting. It won’t make players hate your game.
Convert it to a mesh.
Select all parts, right click, choose export selection, get the file, put it in blender or something, then export it as a mesh file, and upload the mesh to roblox.
If you want something more in depth there’s probably a tutorial out there.
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Yeah, it is at high speeds so you won’t notice, but I will.