“In fiscal year 2007the most recent year for which data on combined spending by the federal government and by state and local governments are availabletotal public spending for transportation and water infrastructure was $356 billion, or 2.4 percent of the nations economic output as measured by its gross domestic product. For the purposes of this study, transportation and water infrastructure encompasses infrastructure for all forms of surface transportation (highways, mass transit, rail, and waterways), aviation, water resources (such as dams and levees), and water distribution and wastewater treatment.
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