I've been commuting to work again recently in the Big Smoke, and I've noticed a lot of riders using what I assume are roadie club run hand signals (I'm not in a club, you see, and I brake all 'the rules'). So, if they are turning right, rather than stick their right arm out, they use their left arm behind their back and point right.
Someone can explain, I'm sure - but I'm guessing this reduces your drag when signalling and also stops you inadvertently punching a passing club mate as he comes through?
Which is all well and good. But on the commute, will car drivers understand this?
EDIT: sorry, just realised I put this in the wrong section. My bad.