G'day - if the Department of Transport are showing no interest here, one way to bring up this concern would be to raise it with the current Thinker in Residence Fred Hansen: http://www.thinkers.sa.gov.au/fhansen.html
He has the ear of government and held a forum with cycling, walking and public transports late last year to put our concerns forward.
I see on the website he is scheduled to be in town again first 2 weeks of March...
Yes, I have experienced this with buses and trucks, and always listen for loud larger engines. (One cyclist told me that on his country route, the long distance buses have rear engines, so he cannot hear the bus early.) One place to be wary is on King William Road, where the bus is passing the Adelaide Oval entrance and is about to enter a 'squeeze point' that ACC deliberately introduced a few years back. Here I cycle as close as I can to the kerb. I heard a bus, checked behind, and deliberately fell onto the footpath while pulling my bicycle on top of me. Next moment the rear end of the bendie swept where I had been.
Another time I was not so lucky in King William Road. I was closer to the Festival Centre, with parked cars on my left, when a bus 'overtook without due care' and did not leave the minimum one metre. Injured.
Now Prospect Council plans for a section of Prospect Road to be narrowed, leaving less than 0.3 metre between cyclist and overtaking bus. There are 154 buses every weekday.