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Another cool prototype. "Contrail" is a device that applies chalk to the rear tire of your bike, leaving a trail behind you. It leaves trails for motorists and other cyclists to see, enabling bikers to "reclaim this crucial shared space." Anyone want to build it?
http://blog.makezine.com/archive/2009/03/bike_accessory_leaves_a_trail_of_ch.html
http://blog.makezine.com/archive/2009/03/bike_accessory_leaves_a_trail_of_ch.html
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