What is Reauthorization?
Federal surface transportation reauthorization is the process Congress uses to renew, fund, and update the programs that support the nation’s roads, bridges, transit systems, freight networks, and other transportation infrastructure.
Typically enacted every five to six years, a reauthorization law establishes federal funding levels, sets national priorities, determines which projects and activities are eligible, and shapes how transportation investments move from planning to delivery.
For metropolitan planning organizations (MPOs), reauthorization is an important opportunity to strengthen the federal policies that affect regional planning, funding access, project selection, and implementation.
The Infrastructure Investment and Jobs Act (IIJA) expires on September 30, 2026. Congress has made meaningful progress toward the next surface transportation law, but the process continues to evolve.
- New to the topic? Start with AMPO’s (updated) Reauthorization 101 guide.
- New to MPOs? Learn more in AMPO’s MPO 101 Primer and Transportation Improvement Program (TIP) One-pager.
- Looking for the latest news on reauthorization? Subscribe to AMPO’s National Beat Policy Newsletter.


