Firstly we have no idea if it was his fault or not, and fair do's that the guy wants to keep his independence, but there really is no need for him to be out on the roads without a driver. If he wants to drive occasionally there must be enough private roads he can drive on, and he can certainly afford a driver out in the real world.
Just reading that he drove Obama and his wife at 94, how did the CIA allow that ? (unless it was on said private roads).
I know from past experience of him (through work - he was still flying passenger aircraft at 70), that he is a very very stubborn man, but surely he needs to be told now that he has to have a driver.