That's still an excuse. You don't have to be driving on the road
10+ hours a day before concentration and road awareness need be
discussed with sensible understanding.
The average joe while merely driving to work, from work, ferry
colleagues, meeting clients, etc. could well be holding a job that
requires manual work (away from the driving seat), a great deal of
mind work (outside of the confines of a car), make decisions day in
and out that could affect the livelihood of hundreds under his
employ, a job that comes with stress and responsibility that goes
beyond 10 hours daily. The chappie drives. By the time he's done
with his job and gets into his car to drive home, he's tired,
weary, his concentration won't be as it was when he started the
day. Can this not result in a tiredness that is comparable, if not
exceed, the hardworking taxi driver?
At the end of the day, whatever job you hold, be it on the road or
off, once you get in a car, a machine that can take a life, you
have to be responsible for ALL your actions. There are many other
jobs that require people to be on the road - driving - for hours on
ends, not just taxi drivers. Yet, the most dangerous,
irresponsible, selfish drivers I have seen, I am sad to say, are
still taxi drivers. I have sat in and seen even taxi drivers
themselves shake their heads and berate fellow reckless taxi
drivers who cut into their lanes, suddenly jam their brakes to pick
up passengers, etc. 
