Americans Do Not Walk The Walk, And That’s A Growing Problem : The Two-Way : NPR

"Americans now walk the least of any industrialized nation in the world," says writer Tom Vanderbilt. A reliance on cars, combined with a lack of sidewalks, means that what started as a push for convenience has become a difficult problem.

http://www.npr.org/blogs/thetwo-way/2012/04/16/150586667/americans-do-not-walk-the-walk-and-thats-a-growing-problem