Boulder envisions its bike future:

Topics at the summit mentioned in this article included car-free streets, bike service stations, education initiatives, better transit integration, additional trail development, and more recreational and sport cycling promotion. Creating a vision, and continually pushing the envelope, is an important component of any advocacy effort.

I want car-free streets in Chicago so badly. We could create bike expressways on the major commute routes during certain times of the day and year. Perhaps close off one lane of Ashland Ave. for North-South bike travel because we all know Halsted is too crowded and the roadway has too many patches.
Similarly, Portland just created a double-wide bike lane across one of its bridges so that faster riders can safely pass slower riders.