Instructions
Starting from the main landing view in National Network Map
Use the View by menu to choose the Networks view
Choose the state jurisdiction which administers the network you would like to download data for. For this example we will use Queensland:
Select a Network you would like the GIS data for and click on the question mark icon
Click the Download Network button
The network data will be downloaded to your browsers download directory in GeoPackage format
Open the GeoPackage in a spatial data viewer like QGIS or ArcGIS
A GeoPackage is an open source, open standard and platform independent data format which can be opened in a variety of software.