What percentage of funding did the Federal Aid Highway Act allocate from the federal government for interstate highways?

The Federal Aid Highway Act, enacted in 1956, allocated a significant percentage of funding for the construction of the interstate highway system. Specifically, it provided for the federal government to cover 90% of the costs associated with the construction of the interstate highways. This substantial funding commitment was designed to expedite the development of a national network of highways to improve transportation and connect various regions across the United States. The allocation was pivotal in transforming the nation's infrastructure, facilitating commerce, and enhancing travel, underscoring the federal government's role in efficiently addressing the growing demand for reliable transportation routes during that era.