on an unrelated note i imagine track designer is quite an interesting job.
i presume you are not doing the art for the levels, merely tying everything together, or am i wrong?
also, do you get to do a fair amount of iteration on tracks or are they decided upon by outside forces? i guess you can't change real life tracks but do you get to tweak them for the game balance?
would love to hear about the process of designing a track for a racing game, and the performance and optimisation factors you have to think about.