Figure 53 - Federal, State, and Local Government Highway Maintenance Expenditures: 1991-2001

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NOTE: Although dollar values in most other sections of this book have been converted to chained 1996 dollars, these data are...

Key Air Emissions

Transportation in 2001 emitted 66 percent of the nation’s carbon monoxide (CO), 47 percent of nitrogen oxides (NOx, 35 percent of volatile organic compounds (VOC), 5 percent of particulates, 6 percent of ammonia, and 4 percent of sulfur dioxide.1 Highway vehicles...

Figure 73 - Transportation Air Emissions by Type of Pollutant: 1991-2001

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NOTES: Revisions to previous estimates are all related to the development of the 1999 National Emissions Inventory (NEI).  The...

Figure 5 - Change in Passenger-Miles by Selected Mode: 1990-2000

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NOTES: Transit includes motor bus, heavy rail, commuter rail, light rail, ferryboat, trolley bus, demand responsive, and others. Motor bus...

Figure 37 - Average Transit Fare per Passenger-Mile: Fiscal Years 1990-2000

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Modes included are heavy, commuter, and light rail; bus; demand responsive; trolley bus; ferryboat; vanpool; tramway; monorail; automated guideway;...

Figure 79 - Hazardous Materials Transportation Incidents by Mode: 1991-2001

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NOTES: Water data are not included. On an average annual basis, 9 incidents are reported by vessels. Two injuries were reported in 1998; none in...

Figure 8 - Modal Shares of Domestic Freight Ton-Miles: 2000

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SOURCES: Air, pipeline, and water—U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics...

Figure 29 - Modal Share of Person Trips: 2001

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NOTE: The 2001 National Household Travel Survey “travel period” data were not available when this report was prepared. Without these data, vacation trips and...

Figure 58 - Saint Lawrence Seaway Lock Delays by Cause: 1990-2001

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NOTES: “Weather-related” includes poor visibility and high wind/ice; “All other” includes vessel incidents, lock equipment...

Figure 104 - Federal, State, and Local Government Transportation-Related Revenues: 1990-2000

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SOURCES: All except as noted—U.S. Department of Transportation, Bureau of Transportation Statistics, "Government...