I completely disagree lizzy.I do not believe they will become the norm,I think at the moment there is no huge demand for them either by drivers,or customers.although I am not out there working,I know a lot of taxi drivers all of whom are completely indifferent to them.its only F,N gobshites,and Ebbs plebs who are afraid to say no to their bosses who have them.people ,in the event of time will not appreciate the loss od conversation, and banter that these things will invariably will result in