The Most Bike-Friendly Cities
North American cities include Boulder, CO; Davis, CA; Chicago, IL; and Ottowa, Ontario:
"Canada's capital claims the highest percentage of bike commuters in the country, if not the continent. Its 170 km of paths make it easy to get from point A to B, though two-wheeled traffic is sure to drop between December and March. Visit the City of Ottawa website for more."
Cape Town, South Africa is singled out for recent bike-friendly improvements.