According to the Criminal Code;
39. (1) Every one who is in peaceable possession of personal property under a claim of right, and every one acting under his authority, is protected from criminal responsibility for defending that possession, even against a person entitled by law to possession of it, if he uses no more force than is necessary.
The case law that I have found would indicate that a person speeding over 50km/h could in theory refuse to exit the vehicle and remain in the vehicle to defend it from being towed, thereby using "reasonable force" to defend their possession (in this case the car) against a person entitled by law to possession of it (the police officer). This would also stand within the overall tone of the Charter rights protecting against UNLAWFUL search and SEIZURE whereby the car is being UNLAWFULLY SEIZED as DUE PROCESS has not been carried out in a court of law. The seizure is punitive in nature.
If I was a single man with sufficient funds I would consider testing this, just for the principle that I do not feel that the police have the right to take a car for a week as this is a clearly punitive action, not based on any due process.
On the other hand, I personally can not see a situation where I would be speeding that fast, and as I have a family to take care of, I would not wish to act in a manner that would cost my family undue hardship.

