Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

 Find the latest Coronavirus-related transportation statistics on the BTS COVID-19 landing page.

United States Department of Transportation United States Department of Transportation

Figure 3. Detrended Freight TSI, Detrended and Smoothed Freight TSI and Growth Cycles: January 1979–December 2016

Figure

Notes:

Shaded areas indicate decelerations in the economy (growth cycles). Detrending and smoothing refer to a statistical procedure that makes it easier to observe changes in upturns and downturns of the data. Detrending removes the long term growth trend and smoothing eliminates month to month volatility.

Source:

Calculated by U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS) from USDOT BTS, Transportation Services Index, available at www.bts.gov