serious head injury in an accident. there is always a lot of noise about responsible adults being forced to wear helmets and whether this stops people from riding their bikes. to me it is the same as seat belts. you can’t prove that seat belts or bike helmets make it less safe. and anyway, those people that don’t ride because they don’t want to wear a helmet, probably don’t really want to ride anyway. if you turn up to a club ride without a helmet, you will be asked to leave, even if it has happened by accident. it does happen more in winter when people wear caps and stuff 