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Helmets, even the light helmets bicyclist wear, are very effective at reducing the severity of head injuries. https://pubmed.ncbi.nlm.nih.gov/24686160/

That isn't to say that a policy of requiring helmets is good on net (because people may ride less), but in any accident that you hit your head, you would greatly benefit from wean a helmet.

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This is junk science. The authors simply did the ANSI drop-test in a lab test. In the real-world, 99% of bike crashes with death/severe injury are the result of car-crashes -- which the ANSI drop-test does not model correctly at all.

It's usually a junk comment to call something junk science.

They are claiming 90% risk reduction based on a laboratory model. That model obviously does not track with reality (show me any country where bike helmets reduced death/injury by that amount). If a model does not correlate with the real world, then it is by definition...junk.

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