A recent study found that despite widespread attention to the importance of helmet use, not only has helmet use not gone up, but the severity of cycling injuries has greatly increased. The researchers looked at cyclists admitted to a trauma center in Denver over 11 years. During that time, the severity of injuries and the length of stay for rundown cyclists dramatically increased. The obvious answer is that more people are riding their bikes, which is great, but the bad news is that the cycling infrastructure can't handle all the new riders. Inexperienced people are getting on their bikes to be healthy and avoid oil wars, and more of them are getting run over.
The Freakonomics blog on NY Times ran a similar article that posed the questions, "Will Bicycling to Work Get you Killed?" They found that bikers are 12 times more likely to be involved in a fatal accident than car drivers, but also that drivers have a 39% higher mortality rate. Basically, if you can survive the bike ride to work, you'll live a longer life.
