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Sure, but F1 drivers tend to be a fair bit more constrained in the event of a crash. (For reference, it would also be interesting to measure the differences between those accelerations in an F1 driver, and compare those differences to the rugby player (or other contact sport participant))
I still think that peak deceleration is a decent metric to compare the severity of different F1 crashes. Far from being pretty meaningless IMO.
The variables you mention is exactly what I was getting at :)