Bicycle chalk drawing concept?

Contrail is a tool for developing bicycle communities. As you ride, contrail leaves a faint chalk line behind your bike. 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.

Theory

The old cycle: More cars on the road --> more percieved danger for bikers -->fewer bikers on road --> even more cars on the road.
The new cycle: A few bicyclists ride with contrail a couple times per week -->faint lines on the road inspire curiosity and remind bikers where it's safe to ride --> new bikers are encouraged to ride and use contrail --> contrail lines get brighter as community grows.

refferer:
http://gelardi.com
http://www.doobybrain.com
http://www.design21sdn.com
http://bikehacks.com