Urban Review - St. Louis blog has a good discussion of "Parking Spaces / Community Places: Finding the Balance through Smart Growth Solutions." Steve cites a new EPA report and relates it to St. Louis...
Consider the density of the development. Research shows that each time residential density doubles, auto ownership falls by 32 to 40 percent (Holtzclaw et al. 2002). Higher densities mean that destinations are closer together, and more places can be reached on foot and by bicycle—reducing the need to own a car. Density is also closely associated with other factors that influence car ownership, such as the presence of good transit service, the community’s ability to support stores located in neighborhoods, and even the walkability of neighborhood streets.
Lots of good comments follow that article...
Should residential density double in downtown Sarasota? Double again? Would more roads help anything?