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Your numbers are way out.

It says that Highgate is 10 minutes away by road from Old Street. The 271 bus takes more like 40 minutes on a good morning. I don't think it could be done in 10 minutes even without traffic.

The AA route planner gives it as 20 minutes which is optimistic http://www.theaa.com/route-planner/index.jsp#fromNode=182600...

Enfield is 20 minutes from Old Street by road? I don't think so!

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It told me that the City and some parts of London south of the river were 20 minutes away from Highgate. While I have managed to drive from Highgate to Moorgate in seven minutes, it relied on every traffic light along the way being green, it being 7am on a public holiday and a loose regard to the posted speed limit. Any other time forty minutes would be more accurate.

Were you to take the existing road times and triple them, you'd like get a more realistic circle IMO.

Yeah, the speed profiles we're using for the road travel have some inaccuracies as they don't yet account for traffic etc. We'll be putting in a separate mode for buses that will be based off more accurate TfL data, so hopefully won't see as bad a wormhole as that once that's in place!

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