Walkable Cities

Before gas was pushing three dollars a gallon, American cities were walkable, says USU researcher Mike Sweeney. In the 1800s city dwellers worked and shopped close to home, but as trolley systems appeared toward the end of the century, cities expanded. Back then, horses left 30,000 tons of manure on city streets each day. Promoters later used this public sanitation concern to sell the public on cars.