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5 THE STATE OF TRANSPORTATION STATISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105<br />

What We Need To Know About Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105<br />

Can We Answer the Questions <strong>of</strong> Decisionmakers? . . . . . . . . . . . . . . . . . . . . . . . . . . . 108<br />

The BTS Program for Meeting Statistical Needs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112<br />

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114<br />

PART II: TRANSPORTATION AND THE ENVIRONMENT<br />

6 ENVIRONMENTAL IMPACTS OF TRANSPORTATION . . . . . . . . . . . . . . . . . . . . . . . . . . 117<br />

Transportation-Related Environmental Impacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119<br />

Environmental Damage: The Concept <strong>of</strong> Externalities . . . . . . . . . . . . . . . . . . . . . . . . . 122<br />

Current Data Needs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126<br />

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128<br />

Box<br />

6-1 Selected Federal Laws Addressing the Environmental Impacts <strong>of</strong> Transportation . . . . 118<br />

7 ENVIRONMENTAL TRENDS AND THE U.S. TRANSPORTATION SYSTEM . . . . . . . . . . 129<br />

Air Pollution Trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130<br />

Water <strong>and</strong> Groundwater Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146<br />

Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150<br />

Solid Waste . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154<br />

L<strong>and</strong>-Use <strong>and</strong> Habitat Effects <strong>of</strong> Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162<br />

Costs <strong>and</strong> Benefits <strong>of</strong> Environmental Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164<br />

Information Needs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166<br />

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167<br />

Boxes<br />

7-1 Measuring Air Quality <strong>and</strong> Vehicle Emissions Trends . . . . . . . . . . . . . . . . . . . . . . . . . . 131<br />

7-2 Transportation’s Share <strong>of</strong> Mobile Source Pollution . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132<br />

7-3 Dredging <strong>of</strong> Sediments in Ports <strong>and</strong> Harbors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155<br />

7-4 Comparing the Air Pollution Impacts <strong>of</strong> Different Transportation Modes . . . . . . . . . . . 166<br />

8 TRANSPORTATION AND AIR QUALITY: A METROPOLITAN PERSPECTIVE . . . . . . . 170<br />

Metropolitan Emissions <strong>and</strong> Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173<br />

Road Vehicles <strong>and</strong> Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177<br />

Transportation Control Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186<br />

Urban Form, Infrastructure, <strong>and</strong> Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191<br />

Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198<br />

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202<br />

Boxes<br />

8-1 Air Quality St<strong>and</strong>ards <strong>and</strong> Attainment Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174<br />

8-2 Real-World Versus Expected Emission Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184<br />

8-3 Congestion Pricing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187<br />

8-4 South Coast Air Quality Management District . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190<br />

8-5 National Capital Region: Strategies for Conforming to Federal Clean Air St<strong>and</strong>ards . . 192<br />

8-6 Portl<strong>and</strong>, Oregon: Exploring the Transportation/L<strong>and</strong>-Use Link . . . . . . . . . . . . . . . . . . 199<br />

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