I'm guessing NSW, Australia isn't the only place that has a 'points' system on their drivers licenses?
To cut a long story short, various traffic offences carry a various amount of demerit points. Accrue too many points and you lose your licence. Full info is [link|http://www.rta.nsw.gov.au/licensing/a67_c.htm|here at the RTA web site]. In short: Once accuring 12 points, you temporarily lose your licence.
This is in conjunction with fines. So if you can wear the fines, you still have the points to consider. In peak danger periods, primarily long weekends, and Easter, double-point periods are instituted. So for instance if you exceed the speed limit by 45kmh, you accrue 12 points instead of the usual 6. The average licence has a limit of 12 points, so on a double-demerit period you instantly lose your licence.