Anecdotal evidence where not wearing a helmet saved me (some) injury. <forgive me
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A few years ago I locked up the front and rear heading down hill towards a cross roads with the lights on red. It was a hot day and there was surface dust on the road (my brakes have never worked that well before or since!). I was probably doing over 35mph when I locked up.
I was in the left lane, moving cars were on my right. I had a split second choice - splash down in the middle of the carriageway, or try and get out of the way of any traffic. I instinctively chose the latter, my back wheel fishtailed out to the right almost alongside me at this point and I headed towards the kerb.
Impact with the kerb, still doing well over 20mph imho. I released the bars, stamped my left foot into the tarmac and tucked and rolled. I really don't know how, but the only physical damage I had was a grazed left shoulder and the heel of my right hand. A little blood. Nothing touched my head, somehow I had tucked it out of the way. A few bits of grit in my skin, but nothing that an efficient nurse couldn't get out of me with a scrubbing brush. Ow.
I seriously believe that had I got my helmet on at that time, that I wouldn't have completed that roll. Perhaps it would have stopped the roll being completed and I would have slid on my helmet, possibly meaning a more stretched out body impacting the pavement.
Perhaps the helmet would have been badly damaged and it would be me shouting 'A helmet saved my life'.
Either way, if my head (or helmet) had made contact with the floor, I seriously think that I would have hit the ground a hell of a lot harder. An impact like that should have broken bones. I believe that it is only the way in which I rolled that minimised the injuries. It was only because I could tuck my head out of the way that allowed me to roll like that in that situation. I believe that not wearing a helmet saved me a lot of pain.
Since then, I have only bothered to wear my lid when SWMBO dictated it, or when it is raining (it has a little peak!).
I've also been on a ride where I took away a work colleagues helmet because he was showing early signs of heat stroke and needed to cool down quickly.
I do think that the emphasis should be on preventing the cause of injury, rather than making it all go away by using the placebo effect. Training, education and enforcement. Not a plastic head cover.
Until someone can show me a proper study of 20 mph cycle helmet versus 40mph cars situation, all of this means precisely nothing to me.