Rules are the same as listed on speedrun.com/distance.
Note that, by default, abuse of wheelieboosting is banned and the game must be run on the latest patch available at the time of the race. A few accidental wheelieboosts here and there won't result in a DQ but if it's apparent you're doing it intentionally to gain speed then that may result in DQ. This may be judged on a somewhat case by case basis. WB Allowed or Any Patch runs are still allowed to be raced, but this must be clearly indicated in the race info field and races using WB or earlier patches will not be recorded.
Streaming is currently not required, but appreciated.