Number one is backed up by the Australian experience of compulsory helmet laws. Number two is backed up by the dutch experience (hint, it hasn't always been li

Number one is backed up by the Australian experience of compulsory helmet laws. Number two is backed up by the dutch experience (hint, it hasn't always been like that). I wear a helment when I am unsure of the safety of cycling conditions on my planned route, or on an unknown route. Otherwise I don't.