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Lets put them alongside steak knives so we aren't confused by them both being safety products but instead just products.
The test for steak knives being good is showing them cutting meat so if you want a lesser test(30mph down to 12mph) why not cut butter with it and call it adequate?
Good luck cutting your steak with a butter knife? Bicycle helmets with motor traffic?
Now I don't really know anything about helmet testing, but you've pulled the debate into whether or not helmets are effective at protecting head injuries. If you ignore other factors (ie. Whether you are more likely to be hit in the first place), then a series of major studies have shown that helmets could prevent the chance of serious head injury by up to 65%.
Hope you don't mind if I just link the article I found it in rather than the actual study. Seems to do a good job of telling both sides of the argument:
https://www.theguardian.com/lifeandstyle/2017/mar/21/bike-helmet-cyclists-safe-urban-warfare-wheels
Basically even if there is anything I can do to minimise the chance of something I enjoy (cycling) turning me into a vegetable I'll take it.
@skydancer I meant it makes sense for the riding I do, which is more off-road, light touring, towpath to work sort of thing. I'm sure if you spend all day in traffic it might even be safer to perhaps not wear one depending on the cyclist. Although I did once headbutt the back of a van.