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Most criminal offences require "intention" or a 'guilty mind'- e.g. for assault, you have to *intend* to hit someone. Unfortunately, offences under provincial legislation, such as Highway Traffic Acts, or different- no intention is required. For example, you can still be convicted of speeding even if you didn't intend to speed. Similarly, you can still be pulled over and found guilty of driving in the bus lane even if you didn't realize it was a bus lane (rather than free-flowing traffic). It may be a defence perhaps if you were driving in the lane due to an absolute emergency (e.g. driving pregnant wife to hospital, or driving in bus lane because another car cut you off forcing you into that lane to avoid collision). However, assuming it was just a careless mistake, it is very unlikely you'll escape liability, even if it was only a brief mistake.
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