![Table 1-1: Public Road Length, Miles by Functional System: 2013](https://www.infrastructureusa.org/wp-content/uploads/2015/11/totalmiles.jpg)
UNITED STATES DEPARTMENT OF TRANSPORTATION
BUREAU OF TRANSPORTATION STATISTICS
The State Transportation Statistics 2015 report contains comprehensive, quantitative data on the following topics: Infrastructure; Safety; Freight Transportation; Passenger Travel; Registered Vehicles and Vehicle-Miles Traveled; Economy and Finance; Energy and Environment