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 Public Construction Spending: Transportation [PBTRANSCONS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/PBTRANSCONS, December 16, 2017.