"Although they mar the beauty of many other state corridors, not one of the 500,000 billboards lining America's major highways can be found in Vermont."
A Global High Shift Scenario:
Impacts And Potential For More Public Transport,
Walking, And Cycling With Lower Car Use
By Michael A. Replogle, Institute for Transportation and Development Policy
& Lewis M. Fulton, University of California, Davis
Two studies shed light on the issues of Walkability and can be downloaded from the sites below:
From the Local Government Commission, The Economic Benefits of Walkable Communities.
From Smart Growth America, Foot Traffic Ahead.
Walkable communities are not just wealthier, but healthier. More here and here.