Which taxi drivers are the worst?

I’ve had my fair share of incidences on the road, some of the worst have been from taxi drivers but out of those,most of them are public hire taxi’s. This could be down to the fact that they are essentially untouchable. The PCO in london licenses +60,000 taxi’s and from the response I have had from them, they do not care what their drivers get up to on the roads. And as I’ve said before, when drivers don’t get pulled up on their behaviour on the roads, it spirals out of control.