"Contrail created by Studio Gelardi, is a tool that attaches to your bike’s seat tube and leaves a colorful chalk line behind you as you ride. The goal is to encourage a new cycle of biking participation by allowing the biking community to leave a unique mark on the road and to reclaim this crucial shared space. It lets bikers take same route, and aslo reminds fellow cyclists where it’s safe to ride if more bicyclists using the Contrail. The Contrail was a finalist in Design 21’s Pedal To The Medal competition and is not in yet in production."
