Strict Liability - The act, itself, is sufficient for conviction. Mens rea need not be present and no defence of Due Diligence is possible.
Absolute Liability - The act, itself, is sufficient for conviction, however, a defence of Due Diligence is possible.
Initially HTA 172's stunt driving charge, the 50+ over speeding issue, was one of Strict Liability. The Supreme Court of Ontario, however, considered this to create a situation in which there was a possibility of imprisonment without giving the accused sufficient chance to mount a defence. For this reason they stated that it must be considered an Absolute Liability offence. This was successfully argued in a case in which a woman started passing a truck on Hwy 7, somewhere up around Tweed, and the truck that she was passing began to speed up in order to block her. It was deemed reasonable that she speed up in order to get around that vehicle, in order to avoid collision with oncoming traffic.
It should also be noted that speeding up in this manner, in order to stop another vehicle from passing, is considered 'racing' under HTA 172.