This doesn't make any sense, mostly because no one reports crashes that did not result in cyclist death because they wore a helmet. I fell of my bike going 30mph and hit the curb head first - the helmet split in half(which is exactly what it's supposed to do) and I was absolutely fine. If I wasn't wearing it, I wouldn't be writing it - I would be dead. But I never reported my "life saving accident" anywhere,and I'm sure millions of people never report theirs either. While I wouldn't want to make helmets mandatory, I would certainly like to ban headphones while riding bicycles - it's so dangerous not knowing what's behind you based on sound that I literally can't understand how people can be so careless.