
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of highways that form part of the National Highway System in the United States. The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, established this system and was signed into law by President Dwight Eisenhower on June 29, 1956. The act authorized the construction of a 41,000-mile network of highways spanning the nation, with the federal government paying 90% of the cost.
| Characteristics | Values |
|---|---|
| Name of the law | Federal-Aid Highway Act of 1956 |
| Other names | National Interstate and Defense Highways Act of 1956 |
| Signed into law by | President Dwight Eisenhower |
| Date | June 29, 1956 |
| Funding | $25 billion or $26 billion |
| Funding source | Highway Trust Fund, funded by an increased gas tax, along with taxes on tires, buses, and trucks |
| Federal government's share of the cost | 90% |
| Length of the highway system | 41,000 miles |
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What You'll Learn

The Federal-Aid Highway Act of 1956
The movement behind the construction of a transcontinental superhighway began in the 1930s when President Franklin D. Roosevelt expressed interest in building a network of toll superhighways to provide jobs during the Great Depression. This resulted in the Federal-Aid Highway Act of 1938, which directed the Bureau of Public Roads (BPR) chief to study the feasibility of a six-route toll network. However, with America's entry into World War II, the time for a massive highway program had not yet come.
During World War II, then-General Eisenhower was stationed in Germany, where he was impressed by the network of high-speed roads, the Reichsautobahnen or autobahns. He also noted the enhanced mobility of the Allies on these roads as they fought their way into Germany. These experiences significantly shaped Eisenhower's views on highways and their role in national defense. After becoming president in 1953, Eisenhower was determined to build the highways that lawmakers had been discussing for years.
In his 1954 State of the Union address, Eisenhower proposed an American interstate highway system, justifying it as a national defense program for transporting troops and evacuating cities in case of nuclear attack. He attempted to finance the system through a federal bond issue, but this plan was rejected by Tennessee Senator Albert Gore, Sr., who substituted his own bill. Eisenhower initially preferred a system of toll roads, but this idea was nixed by House Democrats. Eventually, Eisenhower and the House Democrats agreed to finance the system through the Highway Trust Fund, funded by an increased gas tax and taxes on tires, buses, and trucks.
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Dwight D. Eisenhower's influence
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Eisenhower Interstate System, was championed by President Eisenhower. The Interstate Highway System is a network of controlled-access highways that forms part of the National Highway System in the United States.
Eisenhower's support for the system was influenced by his experiences as a young Army officer. In 1919, he accompanied the Motor Transport Corps convoy on a 3,200-mile trip across the United States. The convoy encountered numerous difficulties along the way, including poor-quality bridges and roads that were little more than "dust, ruts, pits, and holes." This experience, along with his appreciation of the German autobahn system while serving as Supreme Commander of Allied Forces in Europe during World War II, convinced Eisenhower of the need for safer and faster highways.
In 1953, Eisenhower appointed General Lucius D. Clay to head a committee charged with proposing an interstate highway system plan. Clay's committee proposed a 10-year, $100 billion program to build 40,000 miles of divided highways connecting all American cities with a population of over 50,000. Eisenhower initially favoured a system of toll roads, but Clay convinced him that this was not feasible outside of highly populated coastal areas. In February 1955, Eisenhower forwarded Clay's proposal to Congress, and in June 1956, he signed the Federal Aid Highway Act of 1956 into law.
The Federal Aid Highway Act of 1956 established a program for funding and building the interstate highway system, with the federal government paying for 90% of the construction costs. The act turned a patchwork of local roads into a unified national transportation network, with all freeways and nationally unified standards for construction and signage. Eisenhower supported the system as a way to improve highway safety, relieve congestion, and support economic development. Additionally, defence was a primary motivation, as the highways could be used for transporting troops and evacuating cities in the event of a nuclear attack.
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Funding
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly referred to as the Interstate Highway System, is a network of controlled-access highways that form part of the National Highway System in the United States.
The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act, established the interstate highway system in the United States. The act was signed into law by President Dwight Eisenhower on June 29, 1956, and allocated $25-26 billion for the construction of a 41,000-mile network of interstate highways spanning the nation. The federal government agreed to pay 90% of the cost of expressway construction, with the remaining 10% expected to come from state and local governments. The act authorized an increase in gas taxes, along with taxes on tires, buses, and trucks, to fund the Highway Trust Fund, which would finance the construction of the highways.
The movement for a transcontinental superhighway began in the 1930s when President Franklin D. Roosevelt expressed interest in constructing a network of toll superhighways to provide jobs during the Great Depression. This resulted in the Federal-Aid Highway Act of 1938, which directed the Bureau of Public Roads (BPR) chief to study the feasibility of a six-route toll network. However, with America's entry into World War II, the time for a massive highway program had not yet come.
After the war, the Federal-Aid Highway Act of 1944 funded highway improvements and authorized the construction of 40,000 miles of a "National System of Interstate Highways", but it did not provide a funding source. In 1954, President Eisenhower, influenced by his experiences with German autobahns during World War II, proposed an interstate highway system in his State of the Union address, emphasizing its importance for national defense. Initially, he suggested financing the system through a federal bond issue, but this plan was rejected by Congress. Instead, the Highway Trust Fund, funded by gasoline taxes, was chosen as the financing method.
Today, Interstate Highways financed with federal funds are known as "chargeable" Interstate routes. Federal laws also permit "non-chargeable" Interstate routes, which are funded similarly to state and US Highways, to be signed as Interstates if they meet specific standards and are logical additions to the system. As maintenance costs have risen, some Interstates are now privately maintained, and toll roads have become more common to help cover these expenses.
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National defence
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, was established by the Federal-Aid Highway Act of 1956. The law was signed by President Eisenhower on June 29, 1956.
The creation of the Interstate Highway System was driven by national defence considerations. During World War II, Eisenhower witnessed the strategic advantages of Germany's autobahn network, which offered ease of travel and enhanced the mobility of Allied forces. These experiences influenced his views on the importance of highways for national defence. In his 1954 State of the Union address, Eisenhower emphasised the need for a "safe and adequate highway system" to protect the interests of American citizens. He also recognised the potential military applications of highways, including the transportation of troops and the evacuation of cities in the event of a nuclear attack.
The Federal-Aid Highway Act of 1956 authorised the construction of a 41,000-mile network of interstate highways spanning the nation. This transcontinental superhighway system was designed to improve mobility and connectivity across the country, enhancing the nation's defence capabilities. The act allocated $25-$26 billion for the construction of the highway network, with the federal government committing to cover 90% of the construction costs.
The establishment of the Interstate Highway System under the Federal-Aid Highway Act of 1956 represented a significant investment in the nation's infrastructure and defence capabilities. By creating a network of controlled-access highways, the act improved the mobility of both civilian and military forces, ensuring safer and faster travel across the country. The system's expansion and connectivity played a crucial role in strengthening the United States' defence posture and strategic readiness.
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Community impact
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, was established when President Eisenhower signed the Federal Aid Highway Act into law in June 1956. The Act created a national transportation network of highways stretching from coast to coast, linking all American cities with populations of greater than 50,000.
The creation of the Interstate Highway System had a significant impact on communities across the United States, with both positive and negative consequences.
On the positive side, the highway system contributed to economic growth, with a 1996 report estimating that it returned $6 of value for every $1 invested. The highways improved travel and transportation across the country, connecting previously unconnected local roads and facilitating trade.
However, the construction of the highways also led to the displacement and devastation of some communities, particularly vulnerable, largely Black urban neighbourhoods. In New Orleans, for example, the construction of I-10 resulted in the uprooting of oak trees and the demolition of 500 homes, destroying the cultural and commercial centre of the Black community. Similar impacts were felt in Tampa, Florida, where highway construction, along with public housing and urban renewal programs, was used to eliminate Black communities.
The process of highway construction also led to a pushback from communities, with the "highway revolts" seeing more affluent communities block projects, while poorer and more vulnerable communities were often unable to prevent the destruction of their neighbourhoods.
The proliferation of highways also contributed to the expansion of American suburbs, increasing the costs of maintaining freeway infrastructure. This has led to the rise of toll roads and the potential for future tolling of existing highways to meet maintenance and expansion demands.
Overall, while the Interstate Highway System brought benefits to the country as a whole, its impact on individual communities was mixed, with some experiencing displacement, segregation, and devastation as a result of its creation.
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Frequently asked questions
The Federal-Aid Highway Act of 1956, also known as the National Interstate and Defense Highways Act of 1956.
President Dwight Eisenhower signed the act into law on June 29, 1956.
The Interstate Highway System, also known as the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States.
The Interstate Highway System is more than 40,000 miles long, with some sources citing it as 41,000 or 42,000 miles.
The act was created to establish an interstate highway system in the United States, improving transportation and national defense. During World War II, Eisenhower witnessed the advantage of Germany's autobahn network and the importance of highways for national defense.







































