That sounds like it would have been me, I was just returning from a spin through the Numinbah Valley, over Pine Creak Rd and the Springbrook Road down into Mudgeeraba. I wear a yellow safety vest, but it is only hot when not moving. The vest is only lightweight/open weave and my jacket beneath it is mostly mesh. Of course, I prefer to keep moving, it is more fun that way. I saw a bus driver wave at me (at least, I think it was at me!) - was that you?