Introduction

America’s transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:

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Glossary

Air carrier—Certificated provider of scheduled and nonscheduled services.

Annual delay—Extra travel time for peak period travel during the year divided by the number of travelers who begin a trip during the peak period (6 to 9 a.m. and 4 to 7 p.m.). Free-flow...

Figure 16 Index of Key Air Pollutant Emissions from U.S. Transportation: 1980-2002

Index: 1980 = 1.0, 1990 = 1.0 for PM-2.5 and ammonia

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Figure 16 Index of Key Air Pollutant Emissions from U.S. Transportation: 1980-2002

Index: 1980 = 1.0, 1990 = 1.0 for PM-2.5 and ammonia

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Key: PM-10 and PM-2.5 = airborne particulates of less than 10 microns or 2.5 microns,...

Figure 15 U.S. Carbon Dioxide Emissions from Energy Use: 1980-2003

Million metric tons of carbon

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Figure 15 U.S. Carbon Dioxide Emissions from Energy Use: 1980-2003

Million metric tons of carbon

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Notes: One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed across sectors....

Figure 14 Oil Spills Reported to the U.S. Coast Guard by Sources: 1991-2001

(Gallons)

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Figure 14 Oil Spills Reported to the U.S. Coast Guard by Sources: 1991-2001

(Gallons)

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Source: U.S. Department of Transportation, Bureau of Transportation Statistics, special tabulation, based on U.S. Department of Homeland...

Figure 13 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2003

(Miles per gallon)

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Figure 13 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2003

(Miles per gallon)

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Note: 2003 data are preliminary.

Source: U.S. Department of Transportation, National Highway...