Dave won't receive a summons for "speed dangerous" (even though it's warranted for 45kph over).
The $600 fine, 6 demerit points & 6 mths loss of licence is actually a very good outcome for the cops.
I advised Dave to return the cops phone call immediately (to make their life easier) without any admission which is what they want from you when they ring.
For them to serve him a "speed dangerous" now, it would tie up the courts and further govt expense for possibly not necesarily a better outcome than they have on the table now. There have been lawyers that have argued the "proof of driver" deal before and although the "speed dangerous" is then dropped, they still result in loss of licence & fines.
If Dave on the other hand said, "yeah that was me driving", he'd expect another visit me thinks.........whenever you are 45kph over, you'll always get a phone call or visit 1st for that very reason.