Itchy & Scratchy Land: Crafting

"afantis84;c-1953998" wrote:
How do you get past the 3rd part?

there appears to be a bug. What I did was to take the Injury 500 to pieces then rebuild it again. Once the cars go around the track it should trigger the next stage. If it doesn't put the track pieces into storage, sync the game (go to your neighbours and back again) and then bring them out and try again.