I had a B double toot me as he was overtaking me on Centre Dandenong road this morning. I had a chat with him at the next lights.
Nutshell version: he understood that it was legal and correct for a cyclist to ride on the road but thought `common sense' would dictate I'd prefer to ride in the service road.
I explained to him that uncontrolled intersections are one of the most dangerous constructs on the road for a cyclist. One second he's got a clear road, the next second a cyclist pops out. If I stay on the road he's got much more time to see and react to my presence on the road.
He understood that, in fact you could see the light bulb of comoprehension going off.
Next lights I'm filtering right so I give him the big thumbs up as he's heading straight on and get a `toot toot' in return :-)