Speed/acrobatic car control challenge

Author Notes Hi everybody, i have tried to design and build a track that is quite unusual and very hard to master, and this is what i came up with. The track has many special tricks, diffrent type of tracks ( dirt,...). However, this is just a sort of testing track, as you look at the track you will see that it needs to be improved, but i want some people test it before i release the final version. So please, if you have any suggestions, advice etc... Please mail me.