The Transport and Topography dataset is underpinned by a road centreline layer of over 2.7 million kilometres of roads, together with more than 30 feature types within transport, hydrology and green space themes. Roads - a national coverage of network roads at all levels within Australia. Everything from major highways to outback tracks, new roads and changes to current roads. Airports - all aspects of airport infrastructure within Australia, including all airports from international to local landing strips.