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Good review of the complex science around cycle helmets and safety. The article also touches on the unintended effects of helmet mandate laws (which have been repealed in many US cities).
Shout out to Ian Walker of Swansea University and his heroic measuring of passing distance of vehicles with various cycling road positions and outfits. (Wearing a helmet led to closer passes. Wearing a vest with “Police” written on it led to more courteous drivers.)
“Some cyclists refuse to wear helmets on principle. They have their reasons.”
Source: slate.com
helmets helmet cyclists wearing led outfits courteous heroic