I think taxi drivers and other so called other "professional drivers" seem to think that because they are on the road most of the time, they own it and therefore that entitles them to drive like tosspots.
The missus dad is one of these so called "professional drivers", hes absolutely terrible at driving, speeds everywhere, gets angry at other drivers, throws the car about, hes impatient and generally drives like a knob. I wont even go in his car, mainly as it makes me feel sick. Oh and you could probably guess, he drives a Vectra... (and a white van at work)