"Compiled and published by the U.S. Department of Transportation's Bureau of Transportation Statistics (BTS), 'National Transportation Statistics' presents information on the U.S. transportation system, including its physical components, safety record, economic performance, energy use, and environmental impacts. 'National Transportation Statistics' is a companion document to the 'Transportation Statistics Annual Report,' which analyzes some of the data presented here, and 'State Transportation Statistics,' which presents state-level data on many of the same topics presented here. The report has four chapters:  Chapter 1 provides data on the extent, condition, use, and performance of the physical transportation network.  Chapter 2 details transportation's safety record, giving data on accidents, crashes, fatalities, and injuries for each transportation mode and hazardous materials.  Chapter 3 focuses on the relationship between transportation and the economy, presenting data on transportation's contribution to the gross domestic product, employment by industry and occupation, and transportation-related consumer and government expenditures.  Chapter 4 presents data on transportation energy use and transportation-related environmental impacts."
Bureau of Transportation Statistics: http://www.bts.gov/