Introduction

Introduction

Compiled and published by the Bureau of Transportation Statistics (BTS), U.S. Department of Transportation, National Transportation Statistics 2001 presents information on the U.S. transportation system, including its physical components, safety record, economic performance, energy use, and environmental impacts. National Transportation Statistics 2001 is a companion document to the Transportation Statistics Annual Report, which analyzes the data presented here.

The report has four chapters:

_ Chapter 1 provides data on the extent, condition, use, and performance of the physical transportation network.

_ Chapter 2 details transportation's safety record, giving data on accidents, crashes, fatalities, and injuries for each mode and for hazardous materials.

_ Chapter 3 focuses on the relationship between transportation and the economy, presenting data on transportation=s contribution to the gross domestic product, employment by industry and occupation, and transportation-related consumer and government expenditures.

_ Chapter 4 presents data on transportation energy use and transportation-related environmental impacts.

Generally, data are presented in five-year increments from 1960 through 1990 and annually thereafter. The web version of the report provides annual data from 1990 onward. Appendix A profiles each mode1. Appendix B contains metric conversions of select tables.

BTS obtained the data in this report from many sources, including federal government agencies, private industry, and associations. Some of the data are based on samples and are subject to sampling variability. Data from all sources may be subject to omissions and errors in reporting, recording, and processing. Documents cited as sources for the tables often provide detailed information about definitions, methodologies, and statistical reliability. In addition, as part of BTS's ongoing efforts to identify and assess the extent of data errors, Appendix C includes a brief discussion of the quality of the data presented in many of the tables.

1The U.S. transportation system comprises six modes: air, highway, transit, rail, water, and pipelines.