Check out our Strava map above showing cycling activity during the night of the Dunwich Dynamo, 20-21 July 2013, when a thousand or so people cycled from London to the Norfolk coast.
A snake of light shows the riders gliding through the night, while the bright lights appearing all over the UK and Europe are the rest of us getting up the next morning.
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Cycle to Work Day with London BikeTubes
Bike Theft Survey