srw
It's a bit more complicated than that...
With any sort of event, especially Ride London with tens of thousands taking part, as already stated, you will get incidents happening. A closed roads event for a long ride like this out into the Surrey Hills really doesn't do cycling any favours. What we want to be doing is encouraging people to think of cycling as a normal everyday activity that they don't need to wear special clothes or a helmet for. That's why the events which close the centre of London only would be far better, and so allowing people to explore the city on 2 wheels without motorised vehicles getting in the way.
I'd love to see the statistics. I think you'd be surprised, particularly in London, how many of the Sportive brigade are also utility cyclists. Rude London is part of the normalisation package.