Somewhat off topic, but I do wonder if some of these have been a net negative in terms of people injured. Shortly after someone drove a van along the pavement on Westminster Bridge all the major bridges had concrete barriers built between the road and pavement, and while I see the reasoning for it, it does seem to me that cyclists who could previously fall relatively harmlessly onto the pavement if caught alongside a bus or other vehicle are now going to be dragged along a concrete blockade instead.