The Copenhagen Wheel

http://www.boston.com/lifestyle/green/greenblog/2009/12/mit_wheels_out_new_bike_protot.html

"Even in this city where bicycles outnumber cars on virtually every street, officials are hoping to persuade more people to give up four wheels for two.

Yes, a whopping 37 percent of commuters ride bikes to work or school in the Danish capital -- and air hoses are more common here than gas pumps. But city officials are having trouble bumping that percentage up to a 2015 goal of 50 percent."