The motocross.rar file you have requested: Tracks / Fast-tech / MotoCross - 16.49kb is not available. Perhaps try browsing all files for the game TrackMania Nations Forever and upload any files you want to share or are missing. This is the only information we could locate:
MotoCross is a dirt track that is made to look like a motocross, closed stadium. The detail, signs, and ground textures echo the effect the author is trying to make; and he does it well. This is a great map for any motocross fan.