Americans pay too little for gasoline and diesel, and our subsequent driving of 2.9 trillion miles annually is a key factor in our trade deficit, military excursions, health and obesity crisis, air and water pollution, and greenhouse emissions. We keep hoping to defeat congestion by building highways — a counterproductive proposition.........If we’d use our cars smarter, we’d mitigate a host of problems and prevent our grandchildren from following our children in fighting wars in the Middle East.  Randy Salzman, New York Times