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The U.S. federal-aid highway program was commenced in 1916, with milestones of Federal-Aid Highway Act of 1944 and Federal-Aid Highway Act of 1956.[1]
Before the Interstate Highway System was established in 1956, the federal-aid highway system consisted of three parts:
In modern times, the Federal-Aid Highway Program supports state highway systems by providing financial assistance for the construction, maintenance, and operations of the 3.9-million-mile (6,300,000 km) highway network, including the Interstate Highway System, primary highways, and secondary local roads.[2]