Hey Brian you're so fine you're so fine you blow my mind Hey Brian!
In my area the outright limit has been reducing every few years.
Not all that long ago it was 110kph, then it went to 100kph, it is now 90kph (except on one specific road that has a 100kph limit).
There is talk of introducing the 90kph limit across the state.
I expect this speed limit (and other non-outright limits) to decrease further as our state revenue continues to be wasted on football teams from the mainland (as one example) and therefore more money is needed from the public milking cow.
Like everything else, the reasoning and goalposts keep moving to suit the authorities current position. This 90kph limit was supposedly introduced for a short period (this time to supposedly help Monash University research) and has become permanent.
Propaganda from the government claiming success and great compliance by the public are a farce. Nobody takes a blind bit of notice of it unless forewarned of traps ahead.
Unsigned urban roads have recently been down-limited from 60kph to 50kph and it has been reported here that a 30kph limit is now being considered for these roads.
Roads with schools or other hazardous areas are already alternatively limited.
edit: Funny how these things happen. I just went to a shop and the shop radio had a report on another local limit being reduced (yet again). Anyone want to walk in front of my car with a red flag?
Tim.