Thought someone might be interested in checking this site out:
http://www.arcadegames.net/cannonballrun.htm
Its about the legal cannonball run held in the Northern Territory in 1994. There are no speed limits on the roads there.
Down the bottom of the page are links to the entrance list and the other pages have pics of them. Nothing hi res unforunately.
Some sweet cars including a Maserati Barchetta, an F40 and a Mini Cooper S! Not the best choice for high speed I wouldn't have thought.
I remember the F40 crashing into an officials station and killing the officials, and I don't think the cannonball was ever run again.