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Revision Policy for the Transportation Services Index

Policy Summary

The Bureau of Transportation Statistics (BTS) publishes the TSI monthly. The monthly publication includes the release of the latest month of data and revisions to previous months. 

Reasons for Revision

BTS revises the TSI to include updates and...

TSI Data Source and Data Quality Information

  TSI Freight Data Aviation Revenue Freight Ton-Miles Truck Tonnage Rail Freight Carloads and Intermodal Traffic Inland Waterborne Traffic Pipeline Movements TSI Passenger Data Aviation Revenue Passenger-Miles Rail Revenue Passenger-Miles Public Transit...

Terminology for the Transportation Services Index


Aggregate A total created from smaller units. For instance, the population of a county is an aggregate of the populations of the cities, rural areas, and so forth, that make up the county.

Aggregate data Data that have been combined from data for components. (See Disaggregate data...

Methodology for the Transportation Services Index

Updated March 2022

Bureau of Transportation Statistics (BTS) U.S. Department of Transportation


In fiscal year 2002, researchers from the State University of New York at Albany (Kajal Lahiri and Vincent Yao) and George Washington University (Herman Stekler)...

Transportation Services Index Frequently Asked Questions

For complete methodology, see Documentation for the Transportation Services Index.

What is the Transportation Services Index (TSI)? What does the index tell us? What areas of transportation are covered by the index? Why was the index developed? What does the index provide that...

Transportation Services Index and the Economy-Revisited

December 2014


by Peg Young, Ken Notis, Theresa Firestine


In 2007 the Bureau of Transportation Statistics (BTS), the statistical agency of the U.S. Department of Transportation, published a report entitled: Transportation Services Index and the...