Strangely enough, that's not my pet hate. That distinction goes to self-appointed traffic police who pretend to be nice by directing traffic from behind the wheel instead of simply making their own intentions clear. The worst are in BMWs, they zoom up to a situation, barely paying attention, then when they jerk awake and realise what's going on start telling everyone else what to do with annoying bossy little flicks of the index finger, then get pissed when you decide on the balance of issues and your own vantage point not to obey. Tossers.