"Wearing a helmet can prevent brain injury and deaths in cyclists...."  The data shows clearly that helmets don't prevent death.  When the very first sentence is wrong, it's hard to give the rest of it any credit, especially when the main person being quoted, Dr. Steven Friedman, is an emergency doctor and is very likely suffering from observation bias.  It is proven beyond doubt that cycle helmets don't prevent death, and that protected cycle facilities do, and to concentrate on what doesn't work automatically excludes what does.  Please focus on what does improve the safety of cyclists, not that which has been proven not to work and is just a distraction