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Figure 1: BTS Transportation Services Index
The freight index is a weighted average of data for trucking, freight rail, waterborne, pipeline, and air freight. The passenger index is a weighted average of data for passenger aviation, transit, and passenger rail. The combined index is a weighted average of all these passenger and freight modes. The TSI is a weighted and chained index.
U.S. Department of Transportation, Bureau of Transportation Statistics, Transportation Services Index, available at https://www.transtats.bts.gov/OSEA/TSI/ as of May 2019.