The Bicycle Weather Network turned eight this year. Twelve thousand cyclists have sensors on their bikes now—rain, wind, temperature, ice detection, all feeding into an open mesh network. No cloud, no servers, just bikes talking to bikes.

Started in Nørrebro after three people hit the same ice patch in one morning. Someone mounted a thermometer and a transmitter, someone else wrote the protocol, now your handlebars vibrate when the route ahead is slippery.

The system knows where puddles form before the city does. Amager's wind corridors are mapped to the meter. Vesterbro's microclimates show up as color-coded routes in real time.

Copenhagen's official weather service tried to "integrate the data stream," got politely declined. It's a bike thing. The network is maintained by the people who use it. Turns out that works.

Lars says it's "overkill for a ten-minute commute." He's on there. Checks it every morning. His bike has three sensors now.

Miss when weather was something that just happened.

—Igor

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