The Nullarbor is a vast, arid, unpopulated plain over 1000km wide. I think the comment was meant to suggest that infrastructure projects like this are challenging in Australia, because the distances involved make them expensive, but the low population density makes them much less profitable than in places like the US and Europe with high population densities.
Many tourists from other parts of the world come to Australia thinking they can "just drive" from Melbourne to Cairns or Perth to Adelaide, not realizing how much of an undertaking that is because they don't have a good sense of the distances involved.
The Nullarbor is a vast, arid, unpopulated plain over 1000km wide. I think the comment was meant to suggest that infrastructure projects like this are challenging in Australia, because the distances involved make them expensive, but the low population density makes them much less profitable than in places like the US and Europe with high population densities.
Many tourists from other parts of the world come to Australia thinking they can "just drive" from Melbourne to Cairns or Perth to Adelaide, not realizing how much of an undertaking that is because they don't have a good sense of the distances involved.