Interesting article, and reassuring. One thing it says to me is what we on this list already know, which is that slower by everyone is safer for everyone.
(That said, I have to put in my usual plug for education, if only to help keep you safer at a faster speed. If your typical speed on your own bike is faster than that of an inexperienced person on a bike share bike, education can help keep you safe despite that increased speed, to avoid having to ride slower than you're capable of in order to stay safe. The increased efficiency is more important the further you have to go. That's also an argument against sidewalk riding, and even against some bicycle infrastructure, for faster cyclists. And all cyclists are faster downhill.)
It makes me wonder what further studies with e-bikes might show. If we're taking slower speed as a safety feature, does that mean rental e-bikes are more dangerous, since they allow inexperienced bicyclists ride at a more similar pace to experienced cyclists on traditional bikes?
John Brooking
Cyclist, Cycling Educator, Technologist