41 mph? The Evidence Against the Sunday Times Article

Today The Sunday Times newspaper (UK) had an article on page 5 of the main section entitled “City cyclists turn roads into racetracks” written by Nicholas Hellen and Georgia Graham. I was contacted by Georgia last Thursday and spoke at length to Nicholas about Strava and how it works and particularly about how you can’t trust the timings (and hence speed) of short segments. But from the beginning of the conversation it was very clear what their angle was going to be and basically wanted me (or someone) to be able to quote saying that Strava encourages me to break the law in built up areas. It doesn’t and I don’t. In this post I’ll do my best to explain why that 41 mph should actually be more like 31 mph