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.
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