Intresting,
you right RHETT, but your number plate isnt obstructed. It remains perfectly viewable during the day (and is really hard to spot if you use the spray). and there is no aussie law to say that your license plate has to be photogenic either.
I think that its not that much benifit for us anyway, as 3/4 of our speed cameras are now flashless anyways. In this case would only be good for redlights and oldschool cameras.
Just dont speed, simple.