They usually will not forward to collections unless balance for tickets is high enough (I heard $300)
http://www.attorneygeneral.jus.gov.on.c ... _fines.aspAlso be careful as some provinces (eg Alberta) will actually issue a violation ticket after 365 days of not paying a parking ticket (and that is a provincial offense)
http://www.servicealberta.gov.ab.ca/2096.cfmA provincial offense will go against a US driver (it even can be a reason to deny entry to Canada in the future!)
After the news stories about Toronto tickets do not be surprised if we adopt a similar system