I don't live car free, or commute, nor do I live near any city where I could do this, but Pittsburgh is my "local" city.
Pittsburgh, Pennsylvania kicked off their bike share program yesterday with shutting down Penn Avenue to automotive traffic in the morning.
New Bike-Share Program Kicks Off In Pittsburgh « CBS Pittsburgh
500 bikes at 50 stations in 11 neighborhoods.
It's Pittsburgh, home of the Dirty Dozen racing 13 of the biggest hills in Pittsburgh, including the steepest road in the US (Canton Ave.) I sure hope the bikes have plenty of low gearing, LOL.