From Kaid Benfield's Blog — The Disturbing and Sometimes Tragic Challenge of Walking

In much of America, walking – that most basic and human method of movement, and the one most important to our health – is all but impossible. Maybe not literally impossible, but inconvenient at best, and tragically dangerous way too often. 
Read more: The disturbing and sometimes tragic challenge of walking in America | Kaid Benfield's Blog | Switchboard, from NRDC