Source: U.S. Census Bureau
Release: Construction Spending
Definitions related to the construction data can be found at https://www.census.gov/construction/c30/definitions.html
Methodology details can be found at https://www.census.gov/construction/c30/methodology.html
U.S. Census Bureau, Total Construction Spending: Transportation [TLTRANSCON], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/TLTRANSCON, May 21, 2019.