I've had plenty of taxi drivers who could barely drive, let alone find any given address in their city. And as for doctors, see my answer to potatolicious above

I've had plenty of taxi drivers who could barely drive, let alone find any given address in their city. And as for doctors, see my answer to potatolicious above - I've seen some terrifyingly incompetent ones who really should have been screened out with a fizzbuzz level question.