Photo by Nan Palmero - http://www.flickr.com/photos/nanpalmero/4278432941/
Photo by Richard Masoner / Cyclelicious - http://www.flickr.com/photos/bike/1397097069/
Photo by Werner Kunz - http://www.flickr.com/photos/werkunz/4762772131/
Photo by Till Krech - http://www.flickr.com/photos/extranoise/278465198/
Photo by Mike Riversdale - http://www.flickr.com/photos/mike_riversdale/5460709472/
Photo by palo - http://www.flickr.com/photos/paloetic/4965722997/
Photo by IMLS Digital Collections & Content - http://www.flickr.com/photos/imlsdcc/5577197756/