Introduction

America's transportation system has changed along with the nation's society and economy. The following table puts those changes in perspective:

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Glossary

Air carrierCertificated provider of scheduled and nonscheduled services.

Chained dollarsA method to measure real changes in dollar values between years that uses chain-type indices, rather than constant dollars. The method first calculates the real changes between adjacent...

Figure 15 Index of Key Air Pollutant Emissions from U.S. Transportation: 1975-2000

(Index: 1975= 1.0, 1990 = 1.0 for PM-2.5 and ammonia)

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Figure 15 Index of Key Air Pollutant Emissions from U.S. Transportation: 1975-2000

(Index: 1975= 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 in...

Figure 14 U.S. Carbon Dioxide Emissions from Energy Use

(Million metric tons of carbon)

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Figure 14 U.S. Carbon Dioxide Emissions from Energy Use

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Key: P = preliminary; R = revised.

Notes: One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are spread across end-user sectors...

Figure 13 New Passenger Car and Light Truck Sales: Model Years 1978-2001

(Millions)

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Figure 13 New Passenger Car and Light Truck Sales: Model Years 1978-2001

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Notes: Data are based on Environmental Protection Agency definitions of light trucks (gross vehicle weight 8,500 pounds or less). 2001 data are preliminary.

Figure 12 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2001

(Miles per gallon)

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Figure 12 New Passenger Car and Light Truck Fuel Economy Averages: Model Years 1978-2001

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Source: USDOT, National Highway Traffic Safety Administration, Automotive Fuel Economy Program: Annual Update Calendar Year 2001, September 2001,...