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Sorry, I should have been more clear. That helmets protect the head in a crash pretty obvious, and that metastudy seems to confirm it.

What I had in mind was that helmet users tend to risk-compensate, taking more risks in traffic.



In the majority of cases, risk compensation leads to a decrease in expected benefit of legislation, but does not eliminate the benefit. (At least, that's the message I came away with from reading Foolproof.)


is there any real evidence to back this up - they used to say the same/similar things about seatbelts.




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