Just something I came upon. I Don't know how many people autocross here but I hear this is one of the most fun and best ones here. Click on the links and it describes it. You got to have some serious skill to compete in it. The clostest thing this compares to is a tarmac event in the WRC. Going 110-130 in a 2 lane wide road has to be fun and scary.
http://www.carsracingcars.com/bbc2003.html
http://bluemaxxracing.com/bay_bottom_crawl.htm
http://www.carsracingcars.com/bbc2003.html
http://bluemaxxracing.com/bay_bottom_crawl.htm