>> She would have noticed if
>> there had been proper barriers.
>
> There's a good chance she would've noticed if she'd been watching where
> she was going, too.

But do you really expect everyone to watch where they are going 100% of the 
time?  Have you never put up an umbrella, looked for something in a bag or 
glanced at something sideways whilst walking?  I am pretty sure that if we 
looked back at all the walking you had done in your life, we could choose to 
put an open manhole somewhere and get you to fall in :-)

Even if everyone on the planet watches where they are going 99% of the time, 
that still leaves a huge amount of distance where people aren't looking, and 
then accidents with other objects will happen just by chance.

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