Statewide government trunked radio systems in Australia
The Government Radio Network (GRN) is a network of various systems in place across Australia that enable statewide trunked radio communication. The network operates through inter-linked sites for government and public services such as police, ambulance, fire, or roads authorities which require such a system to function properly.
Source: Wikipedia — Statewide government trunked radio systems in Australia (CC BY-SA 4.0)