Seasonally adjusted data measure the real differences in data trends by adjusting for seasonal factors, such as the change in the number of days, weekends, holidays, or other seasonal activity in a month such as vacation travel. This product uses the FRED API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.
Seasonally adjusted - U.S. Department of Transportation, Bureau of Transportation Statistics, Seasonally Adjusted Transportation Data. https://fred.stlouisfed.org/series/TRANSITD11/
Unadjusted - U.S. Department of Transportation, Federal Transit Administration, National Transit Database and American Public Transportation Association (APTA), Public Transportation Fact Book. https://fred.stlouisfed.org/series/TRANSIT/
Last Updated: January 2019