Federal-aid highway program
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
Federal Aid Highway Act of 1956
The Federal-Aid Highway Act of 1956, popularly known as the National Interstate and Defense Highways Act , was enacted on June 29, 1956, when Dwight D. Eisenhower signed the bill into law...


The federal-aid highway system consists of three parts:
  • The Interstate Highway System
    Interstate Highway System
    The Dwight D. Eisenhower National System of Interstate and Defense Highways, , is a network of limited-access roads including freeways, highways, and expressways forming part of the National Highway System of the United States of America...

  • The Federal-aid primary highway system (FAP system) is defined as a system of connected main highways, selected by each state highway department subject to the approval of the Bureau of Public Roads. It encompasses routes of the Interstate System and other important routes serving essentially through traffic with their urban extensions, including important loops, belt highways, and spurs.

  • The Federal-aid secondary highway system (FAS system) consists of the principal secondary and feeder routes including farm-to-market roads, rural mail and public school bus routes, local rural roads, county and township roads, roads of the county, road class, and their urban extensions. These roads are chosen by the state highway departments and appropriate local road officials cooperatively, subject to approval by the Bureau of Public Roads.
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