Studio Gelardi, a sustainable product design and engineering firm based in New York, USA, invented an interesting tool for developing bicycle communities last year. The “Contrail” is a concept bicycle device that you can fix above the wheel of your bike and that covers the bicycle wheel with a coloured layer of chalk.
The purpose is to provide a better feeling of safety and community to bikers by leaving a mark on the road. Using this device, bicyclists leave a coloured track behind them, allowing other bikers to see where is safe to ride. More bikers taking the same trail, stronger the route will appear on the road – reminding cyclists and also cars drivers that the street is a place shared by different users.