Wileydog3
Sorry to hear about your shoulder, and I hope it is well on its way to recovery, but the point of modern accident analysis and investigation should not be focused on why you did not see the hole (or whole for that matter),
but why the hole was there in the first place,
Why the race organisers did not notify you about it
why the street maintenance people did not repair it before you fell in......
You get the picture..... all accidents have multiple causes and many can be avoided by simply by filling in the hole.
Cheers
Kent