I will bring you a quote from the Google Au Blog.
Starting today, a new feature is going to make those decisions a bit easier. Traffic information on Google Maps will show you the current traffic status of many motorways, major and minor arterial routes in Sydney, Melbourne, Brisbane, and smaller areas like Wollongong, the Central Coast, Geelong, the Sunshine Coast, and the Gold Coast, to help you avoid congested areas and plan the best route from A to B. It’s part of our commitment to making Google Maps an essential tool for Aussies as they go about their daily lives.
Finally, Google Maps now has traffic data for the most of the major cities in Australia. Finally!
Source and quote from the Official Google Australia Blog: Get there faster with traffic information on Google Maps.