Race City's Secret Street Solo 2 events..
From Race City's website :
http://www.racecity.com/
New for 2004, Race City is planning to expand the Secret Street-style racing program inside the Oval in a Solo 2 or autocross type event. In this style of racing, a car and driver are matched against a particular course utilizing the inside area of the oval. The course is outlined with pylons, and to ensure safety and fun, only one car is run at a time. You and your car against the clock! The cars will be teched in a similar manner to the current drag program with the main focus being safety. Snell 90 helmets will be mandatory. More details will be released as available.
11 F-150 Supercrew FX4 5.0