A study by the universities of Washington and Maryland researchers adds further weight to the notion — now confirmed in many studies — that smart growth (higher density, mixed-use, walkable urban form) significantly reduces vehicle miles traveled (VMT). The study, published in Transport and Land Use, emphasizes that reducing block sizes is a more important factor than density and mixed-use in some cases. The study looked at subareas of the Washington DC, Seattle, Baltimore, Richmond VA, and Norfolk VA metro areas. http://bettercities.net/article/block-size-not-just-density-key-cutting-auto-travel-19311