I'm a born and bred Northern Territorian, and up here we've gone through some changes to speed limits. 
 
Until about beginning of 2007, we had open speed limits (yes, go as fast as your vehicle could safely go!) and on all the times doing trips out side of Darwin, there were some people who would do the odd 160 - 180kph in some of the faster cars, but people mainly stayed around 110 - 120kph.
 
Of course there were the clowns out there who did testing and raced quite fast, I've seen Lambos, Ferraris, Porsche all going quite fast: (guilty, I took out my dad's cbr1000 and raced a mate on his bike past the Boys in Blue at about 200kph and they just looked on as we were not speeding - open speed limit.)
 
However, after 2007 the government brought in 130 as the speed limit and now EVERYONE tries to do that in all types of cars, which is NOT safe...4WDs, trucks, sh!tbombs, caravans.  My family owns a property about 120kms outside of Darwin which I visit a fair amount and every weekend its the same story - everyone trying to do 130, no matter what vehicle they are in.
 
Interestingly enough, due to the increased (yep increased) fatalities after speed limits were brought back in, the current government is looking to bring back open speed limits to some parts of the highway.  http://news.drive.com.au/drive/motor-news/open-speed-limits-for-territory-20130508-2j6zy.html
 
I wouldn't mind - get to test out my toys legally and safely, key word being safe. 
At the end of the day, everyone needs to be in a safe environment and not put others at risk.
 
An old Nissan Patrol with flogged out sussy, steering and brake components doing 130kph is a lot more dangerous than a 2012 911 Porsche doing 180kph.

I don't know about everyone but if i'm going 110 in a 110 zone out in the country I feel i'm concentrating on the road than I would be doing 100. Even though you have less time to react, you can just leave a bigger gap.
 
Its interesting that more mandatory tests aren't done to check for drivers ability by relicensing. I know its not a popular option but it would be a great way to ensure that drivers have all the confidence and skills required to be driving on the road. 
 
The TAC ads used to shock me now, but with the word of Youtube and the internet we've likely seen a lot worse in a crash video. It seems like the ads have as much impact.
 
I always find reasoning the best cause of action, why do people loose concentration when driving, because they are stressed, tired, exhausted, frustrated etc.  I'd say a lot more accidents happen during peak hour where there are physically more cars on the road. Its also a time where people are more likely to be stressed etc or tired coming from home.
 
I choose a different way to work now, although its longer and at a lower speed I don't have to stop and start all the time. I am not as stressed anymore and I seem to concentrate a lot better.
 
People will always loose concentration at one stage or another, we are human after all and it is in our nature.
 

let thank the NT guys if this comes into effect....
 
http://smh.drive.com.au/motor-news/1000km-at-130kmh--and-still-alive-20130620-2ok2x.html