I had a chance to try both versions before they were deleted, and while the tracks were not horrible they did need some tweaking to make them much better...
1) like REO said, the road needs to be more defined or another option would be to add a bunch of turn signs.
2) a lot of tree's needed to be reset, some were floating 15 feet off the ground.
3) i liked the textures especially the snow but the transisions could use a bit more work, this won't kill the track if its not corrected but it would make a huge improvement on the overall aesthetics of the track.
4) the terrain surrounding the driving area can be quite abrupt and could use some smoothing to give it a much more realistic appearance and also make it much less frustrating for the racers who happen to wipe out and cannot get back on track without calling the chopper.
over all i liked the track, very promising, but it just seemed incomplete and I think with a little more time spent on it it will be a very good track, if you are tired of working on it just let it sit for a while and come back to it at a later date like most all good track makers do... then upload it again when you feel its the best you can do.
BTW, the mustangs are cool, did you make them?, if not be sure to include a readme text file to give credit where credit is due...
<IMG SRC="http://home.earthlink.net/~richathr/ratlogo10x10.gif" border=0> Malibu350