I don’t know these answers, but I do know Australians know how to build roads.
I once dated a road-builder from Australia (swear to God), and he couldn’t believe 1) how many roads we have and 2) how crappy they are in some parts of the country.
So, my best guess is that they see an enormous opportunity to make money doing something they know very well, and perhaps they think they can make them more efficiently, or using better technology, so maintainance costs will be less.
These are all just guesses though.
As to why we’re not doing it???? I have no idea. We’re too busy building roads in the Middle East???
