Don't know about over there, but in Queensland it's is a joke and lip service.
No one gets pulled up for such a "minor" infringement, police have more important things to do with their limited budget and numbers.
Not to mention the costs in booking these offenders, at least 50% of all drivers, for the paltry fine/slap on the wrist.
So the Pollies bring in laws to pacify the community, but don't legislate sufficient penalties, or if they do, the civil libertarians get up in arms and the penalty is reduced.
Umis 30 min video is a gem and says it all