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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.
Still, I'd say it's a pretty meaningful figure.
I'm not quite sure on the point of that article being brought up. I have no idea how a 50G car crash compares to a 50G rugby tackle in terms of risk of injury. On a tangential note though, it'd be interesting to see how the acceleration differs between their head (where the measurements were taken in the above article) and the body. I imagine the head gets the more extreme measurements (obviously I can see the reasoning for focussing acceleration on the head when it comes to sports like rugby & American football).