Useful references and data sources:
Here are some websites that are rich in Australian road and passenger transport data.
In particular, there is a recent very comprehensive report Population Growth, Jobs Growth and Commuting Flows in Melbourne that has similar coverage to this blog (other cities will also be made available over time).
Australian Bureau of Statistics (links to latest releases):
AustRoads – National Performance Indicators
VicRoads – Traffic Systems Performance Monitoring
South East Queensland: Translink publications (public transport)