Hi, of course at the time I just felt relieved that it was on the other side of the road, and since I realised it was 'that day" (earlier today) I have been trying to remember details. I think it was a light, possibly white-coloured 'transit-type' van. The commotion was a number of people- male- and doors open, or possibly opening and closing; there appeared to be some form of aggravation, like possibly shouting, and I recall a lot of movement. But I had music playing and didn't hear it. I also in retrospect think it might have either been next to the bus stop or just past it, going off the roundabout on Moggill Road towards Brisbane, and got the impression there might have been a partial obstruction to traffic flow. This was to my right as I drove past, and mostly in my peripheral vision, as I was looking straight ahead, and if anything looking left as I approached the roundabout, preparing to drive onto it, and then to take the first exit.
As at the time I had no idea it might be significant I didn't try to remember anything, but definitely recall the location, though not with precision, the type of vehicle, a number of males, and commotion/ aggravation.
I have told the police a little earlier. Don't want to waste their time, but hope it may help them in some way.
http://www.websleuths.com/forums/showthread.php?p=8126470&highlight=jools#post8126470