Below is a Chart for all current UHF CB Channels being used in Australia.
The Chart details every UHF channels main use. Please note the importance of NOT using channel 5 & 35 unless of an emergency, and if abused human life could be at risk due to interference. Also fines in Australia are very high for improper use of (CH 05 & CH 35) the emergency UHF channels.
For explanation on Simplex & Duplex UHF Channels please see this link.
As you will see below the main uses for each channel is a general purpose Australia wide.