There's so many corners like these on the crash compilations you get, it makes you wonder just how few amateur rally cars ever make it to the end of an event!
Seen that one before...
I reckon that the crews were given standardised notes for the stage, poss because no reccing time was availabel and there was simply a mistake in the notes that caused so many incidents.
2 things arise from that vid. 1) Avoid standing on the outside of corners, especially that one. 2) They must have managed to right and get all the cars going again.