Sources:
http://www.flickr.com/photos/21845659@N03/3305935691/sizes/m/
http://www.flickr.com/photos/21845659@N03/3305934287/sizes/m/
http://www.flickr.com/photos/21845659@N03/3306765920/sizes/m/
http://www.flickr.com/photos/fahrradfahrer/2932931228/sizes/m/
http://www.flickr.com/photos/fahrradfahrer/2932072203/sizes/m/
http://www.flickr.com/photos/sashae/3889258599/sizes/m/
http://www.flickr.com/photos/hiawathacyclery/2927581961/sizes/m/
http://www.flickr.com/photos/sashae/3889261645/sizes/l/
http://www.flickr.com/photos/empire_rdr/2460595922/sizes/m/
