"As cycling (as a means of exercise) has a positive impact on health, the key question concerns the balance between the gain of reduced head injury on the one side and the loss of health effects of cycling by a decline of cycle use on the other hand. This is not addressed at all in the editorial. Several people have argued that the positive (life extending) health effects of cycling outnumber the negative health effects of road accidents involving cyclists by a factor 20."
"Head injuries occur to all road users. It would only be logical if the debate of helmet wearing should be extended to car drivers and pedestrians as well. There is no evidence that cyclists have a disproportionate risk of head injury in comparison with other road users."
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1120198
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