Source: U.S. Bureau of the Census
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. Bureau of the Census, Total Construction Spending: Transportation [TLTRANSCONS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/TLTRANSCONS, January 20, 2019.