Hi guys. My vote for worst drivers would go to those old folks who only take their cars out on a Sunday. The old fellas are usually well over 80, wear hats and have bad all round judgement and supreme lack of awareness. The old girls just lack any kind of awareness - one of them stopped in the middle of the road in front of me the other day to have a chat withe her passenger (she probably couldn't cope with driving and talking at the same time), completely unaware there was any traffic behind her. These old folks should have to take a driving test every 3 weeks after the age of 70.
The worst bit of driving I've ever experienced was by courtesy of another biker - I was doing about 80mph in the fast lane of the M1 motorway, driving north in the English Midlands. I'd just overtaken a few cars and was about to move back into the central lane when out of nowhere a bike shot past me on the inside in the same lane as me - there must have been about three feet between us. He must have been doing over 100mph. If I'd have started to move into the inside lane we'd have collided and that would have been no joke at those sort of speeds. In my experience bikers make up some of the best and the worst drivers on the road - and the younger they are the worse they tend to be.