Abstract
The Transportation Services Index (TSI) is the broadest monthly measure of U.S. domestic transportation services and, as such, provides the best snapshot available of the current state of these services. As an index, the TSI reflects real monthly changes in freight and passenger services in the United States. The TSI consists of three component indexes: a freight index, a passenger index, and a combined (or total) index. 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 Economy, on the relationship of the freight portion of the TSI to the growth cycles in the U.S. economy. Since that time, BTS has re-engineered the TSI to improve processing of the monthly data and to improve the methodology and data sources used in the calculation of the index. This report provides details on the updated methodology and data, along with the resultant changes in the turning points of the TSI due to these improvements.
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