Importing race tracks into UE4

So for my own raceing game, I have to make my own levels and tracks, so I opened up my Maya file that had all the different race tracks I made, selected and exported them as an OBJ file one-by-one (there were only around 3 that I actually needed). Next I opened my Unreal Engine 4 race game project and imported each of the tracks, I then had to scale them correctly and I had to add the track textures to each of the tracks individually because fro some reason they weren't imported with textures automatically.