On our Sunday Learner Rides one of the things I emphasize is not to ride too close behind the rider in front. Despite my warnings and often repeated warnings, I still see it happening. I think some riders are quick enough to catch up to the rider in front but lack the confidence of skill to overtake so they sit behind. Then the next rider has to overtake two bikes which is more difficult so they tuck in behind and so the problem grows until we have a row of little ducklings all following each other. This is why we need to leave a decent gap. Interestingly the rider behind initially looks like they are leaving a bit of room but it is amazing how fast that gap shrinks when things start to go wrong. The guy who crashed did a few things wrong in my view but the message I was trying to get across is not about him. The message is - Don't ride too close. Leave a decent gap.