Cycling is more popular in American cities

The following Al Jazeera video shows how cycling is increasingly popular in US cities such as Seattle:

The US has a car culture that includes many people driving big petrol-guzzling vehicles...but two wheels are starting to replace four wheels in some American cities.  Here is the city of Chicago's official cycling website: http://www.cityofchicago.org/city/en/depts/cdot/provdrs/bike.html