Contents：

Introduction

Chapter 1 - The Transportation System

Chapter 2 - Transportation Safety

Chapter 3 - Transportation and the Economy

Chapter 4 - Transportation, Energy, and the Environment

Appendix A - Metric Conversion Tables

Appendix B - Glossary

Appendix C - List of Acronyms and Initialisms

Appendix D - Modal Profiles

Appendix E - Data Source and Accuracy Statements