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SarahC comments on Optimism versus cryonics - Less Wrong
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It actually didn't occur to me to wear a helmet in a car.
For me this was sort of the dividing line between "I'm young, I'll live forever" and "Wait, shit, I won't, I really do need to do all those boring things like use hand sanitizer and look both ways before crossing the street and take my vitamins."
Wait, should I wear a helmet in my car? :) It sounds plausible. I'd say no, because of reduced visibility increasing odds of accident, and already ample protection from airbags, seatbelt, and crumple-zone into rigid structure protecting against crushing.
A good motorcycle helmet provides well over 180 degrees of side vision, while your peripheral vision can only reach about 160 degrees. While I can't find a reference, IIRC the percentage of motorcycling fatalities resulting from head injuries is around 50%, and the percentage of car fatalities resulting from head injuries is considerably higher. So, disregarding the vastly diminished prior probability of all-cause fatalities in a car, you should actually be more adamantly in favor of helmet use in a car than on a motorcycle.
Why would we disregard that?