So, am I right?
OT from just pinch points, I find there's quite a lot of power in really frequent life saver looks just before you need to make a move. I'm sure that sometimes a driver behind slows because I'm doing it, and they therefore expect me to move out. Also, it makes eye contact, however fleetingly. So they know that I know that they know... Oh, I'm confused again...
Of course there's a slight gamble - are they really going to stay slow, or speed up again, but I can often take advantage of the slight pause to muscle my way across the traffic, if I'm turning right for example.
Of course, it might just be that my face wears such an ugly scowl, they back off in horror...