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I think the terrain may play a part in it. As far as I know, the Netherlands is generally flat, where I live it's nothing but hills, people tend to wear helmets

I think the terrain may play a part in it. As far as I know, the Netherlands is generally flat, where I live it's nothing but hills, people tend to wear helmets here, it's also the law, though I've never heard of it really being enforced. I've personally had a couple good falls going down hill where my helmet saved my head.

Freak_NL 7y ago
It's a combination of terrain and high quality bicycle infrastructure. There are plenty of countries were even I as a Dutchman wouldn't cycle without a helmet.