it seems alot of car drivers just don't look out for Bikers, there not expecting us to be there, so i never assume i've been seen unless i can make eye contact with the driver as he comes in at a junction and im about to pull out - For instance onto a roundabout, i tend to wait. Sometimes even when u think you've been seen, there can be nasty suprises in the wing. I had a woman indicate and move over into the middle lane i was occupying without looking that i was already in the space she proposed to take (Roundabout near Tescos and longfields estate Trowbridge) - My observation and quick counter measure saved me a close up the road.