Phantom's right about the complaint log. Anyone can complain about a stupid/bad/drunk etc... driver. They can't do anything about it but they can and do make note of your plate. And it goes into a database for potential further use. I know. A few years ago. Someone must have called me in. I guess I was in a particular rush that day and may have been---may have been--how should I say - exploring the lanes in an aggressive manner. The actual quote from the OPP officer was "weaving in and out of traffic like a sewing machine". That's what my dad told me later on. That was a long time ago people! I'm not like that anymore. And I must have been in a rush for something?! Anyhow. Just to let you know. They really do log your plates.