Wonderring where the meshes/models came from. As far as Im informed LfS does not provide any way to "Rip" or load the tracks in any moddeling program(Wich is a shame. Would be nice to render something with them).
Of course there isn't one - South City is part of paid content of LFS and therefor users should access it only by purchasing LFS licence (S1 or higher). This means such convertion for other game is actually illegal.
I am aware of NinjaRipper and simmilar software but the rips are mostly distorted rendering them unusable. I've used them in the past and gave up quite fast when I saw how bad the rips were.