Figure 1-1 Transportation Services Index of Passenger and Freight Transportation: January 1990–December 2012
SOURCE: TSI: U.S. Department of Transportation. Research and Innovative Technology Administration. Bureau of Transportation Statistics. Transportation Services Index (Updated monthly). Available at www.bts.gov as of March 2013. Recession Dates: National Bureau of Economic Research, U.S. Business Cycle Expansions and Contractions, available at www.nber.org/cycles.html as of February 2013.