When you say "Learn to look at the people", do you mean that as in if they look to their right there is a chance they will manoeuvre right into another lane for example? I have tried looking before but I have always struggled to understand what people will do, (which I believe is due to lack of experience).
I have only every seen one person make a U-turn which was when I was filtering, but I just managed to avoid it because I was only doing about 15mph. I have also found that I am quite often cut off at roundabouts and a lot cars suddenly merge into my lane on bigger roundabouts or change lane last second, but I always assume that the driver will probably cut me off so I always try to be prepared which has saved me a couple of times.
Last question: how do you know if you are in the blind spot of a car?
Thanks!