Interesting thing though, which often gets left out of anything bike helmet-related:
Before we look at how much can we reduce the risk? consider is the risk big enough to devote much energy to reducing?
A number of studies have found that bike-share riders specifically have much lower rates of crashes and injuries than gen pop - essentially, riding a bike share bike bareheaded, already puts you at or below the head injury risk level of the general population of bike riders with helmets. Which itself is pretty much comparable to the risk level of walking.
So: if we’re going to encourage bike share riders to wear a helmet, when they were already as safe riding the bike as walking to and from the bike rack, we have to consider why we would logically single out the riding part of their journey - what’s the justification for taking the helmet off to walk?
