I would definitely support increasing the speed limits on remote roads like that.

But an even better approach would be to reduce their travel time by getting them off the road entirely. A high speed train could get from Sydney to Melbourne in under 5 hours, about half the time it takes to drive. And that’s 5 hours that you could use usefully doing work, reading, or even napping.

I think talk about raising the speed limits is comparatively more useful when talking about people not going between major cities. Roma to Brisbane, for example, or Sydney to Dubbo. Places where high speed rail doesn’t make sense.