State-Controlled Miles — 23rd Annual Highway Report

State-controlled mileage includes the state highway systems, state-agency toll roads, some ferry services, and smaller systems serving universities and state-owned properties. It includes the Interstate System, the National Highway System, and most federal aid system roads. Nationwide in 2015, about 814,154 miles were under state control (Table 5, State-Controlled Highway Mileage), about 870 miles fewer than in 2013 (815,024), the last time this assessment was completed. Small annual changes in state-controlled miles are to be expected, as state systems are expanded to meet increasing needs, but sometimes jurisdictions assume responsibility for mileage previously under state control. The smallest state-owned road systems continue to be Hawaii (1,012 miles) and Rhode Island (1,158 miles); the largest are Texas (80,794 miles) and North Carolina (80,597 miles).

State-Controlled Highway Mileage