Regulation 455/07 states:
Definition, "stunt"
3. For the purposes of section 172 of the Act, "stunt" includes any activity where one or more persons engage in any of the following driving behaviours: 7. Driving a motor vehicle at a rate of speed that is 50 kilometres per hour or more over the speed limit.
There are many ways inwhich a stunt can be done. This charge has been challenged in court many times and it stands. Yes, there is case law to support the stunting legislation.