I was performing an ordinary and not at all illegal cycling manoeuvre recently when a guy in a white van said: “You’re too old to be that stupid.” It was a critique so devastating that I was 10 minutes down the road before I even examined its mechanics. What is the right age to make a right-hand turn? I had also previously assumed that, wearing a bike helmet, I was invisible on the road. I’d come to think of myself as a ninja or a sprite, moving like smoke through traffic, protected only by my agility and smarts.........

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