One commenter said, "Getting doored is a cyclists constant
fear." I never worry about getting doored--I never ride in
the door zone.
Another commenter said the inside cyclist was too close to the
parked cars, but it looked to me that even the outside cyclist
was close enough to get at least his handlebar clipped, and
that would be enough to make him crash. Besides, who would
want to take any bets on how far from the parked cars either
of them would have ridden if they had ridden single file.
Of course, like Andrew said, it's still good advice to motorists
to check before opening their doors, and I suspect that they do
check when parked on very narrow streets, where they know the
moving cars are closer to them.
Kat Iverson