No enforcement of a US plate whatsoever unless the province and state have a mutual as do some province to province...ultimately nothing would likely result...now if you were issued a paper citation you would be required to appear in court if you wished to dispute...or pay if a voluntary fine...if you did neither and were stopped subsequently there may be a warrant out for you which would likley involve an arrest and fine payable in front of a magistrate..default could result in jail..afaik.... we offer no payment on the spot for aliens in Alberta that I'm aware of