Safe biking?

Contrail - Biking Community Tool

Gear | Bike

"Contrail is a tool for developing bicycle communities". It attaches on the wheels of a bike that applies a thin layer of colored chalk to a bike's tire. As you ride, contrail leaves a faint chalk line behind your bike. This concept created by Studio Gelardi. "The goal is to encourage a new cycle of biking participatio n by allowing the biking community to leave a unique mark on the road and to reclaim this crucial shared space." It lets drivers take same route, and aslo remind bikers where it's safe to ride if more  bicyclists using the Contrail. Or you just want to draw your bike route, let you know how to come back home.