I had my first road rage in ages today (normally I expect shoddy driving and I don't let it get to me). I'm in the outside lane, overtaking the cars in lane 2 by about 5mph faster. A car (navy blue focus zetec, reg starting WU06 for any M4 users) goes to changes lane (no indicators) just as I'm getting close about to overtake. He seems to see me as he cancels his pulling out. I'm about 5 ft behind him and go to continue the overtake. Again, he veers (this time completely into my lane), nearly clipping my front wheel and causing me to throw on the brakes. I follow for a bit and he continues to change lanes very quickly (irrespective of what is in front of him) and doesn't use his indicators, till he is completely in the new lane (for some reason, this wound me up far more than people who just don't use indicators at all). Inside lane is bumper to bumper and this **** keeps veering between the 2nd and 3rd lanes in a (thanks to his "after the event" indication) in a completely unpredictable way making overtaking a risky business indeed. I waited for a large gap in front of him in the outside lane and then nailed it past him, finger poised over the horn and with an eye on him. Of course, the moment I'm alongside he again veers into my lane, a blast of the horn slows him enough that I just manage to get by (whilst looking him in the eye and screaming with rage). The guy looks genuinely suprised to see me and his eyebrows go up as he clocks my (rather irrate) expression.
The chap wasn't reading a map/fiddling with sat nav/the stereo, on the phone, old enough to be senile or any of the other usual suspects. He was just a spectacularly poor/dangerous driver.
On the rest of the commute, I encounter 2 other people who repeatedly veer wildly for no reason (almost as if a tyre had blown and they were fighting to get the car under control). As I arrive in work a colleague explains it, it's Friday 13th.