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They pass the same tests as other helmets.
Sure, tests which are essentially worthless for the purpose of helping with 'safety'. But that's by the by. My intended point was rather that they're not primarily designed as 'safety' devices but for aero gain. Anything else is an afterthought.
Also, just to REFUTE your point entirely in one fell stroke, I bet @xavierdisley 's home-made aero helmet didn't pass the same tests. :)
They pass the same tests as other helmets.