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Construction of the original Interstate Highway System was proclaimed complete in 1992, despite deviations from the original 1956 plan and several stretches that did not fully conform with federal standards. The construction of the Interstate Highway System cost approximately $114 billion (equivalent to $618 billion in 2023).
This plan was extended in 1959 to include I-291 and I-491. The first Interstate Highway signs were installed on a completed section of I-91 north of Hartford in 1961. The primary interstates were all completed by 1969 after the last section of I-84 opened between Farmington and Plainville. The rest of the highways were built or renumbered to ...
"The old convoy had started me thinking about good, two-lane highways, but Germany had made me see the wisdom of broader ribbons across the land." His "Grand Plan" for highways, announced in 1954, led to the 1956 legislative breakthrough that created the Highway Trust Fund to accelerate construction of the Interstate System.
It was previously a part of California State Route 238 that was built to Interstate standards, and it was added to the Interstate system using the same number it had as a state highway. It was upgraded to be an auxiliary route of I-80, but no three-digit combinations were available at the time the route was designated an interstate ...
Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System.The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the ...
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower ...
While the highway has existed as far back as 1957, the last section of the entire route to be completed was a section of the Papago Freeway from both I-17 interchanges (including the Deck Park Tunnel) in Phoenix, which opened in 1990. Many widening projects have taken place on the interstate in the late 2000s.
The stretch between Memphis and Nashville, completed on July 24, 1966, was the first major stretch of interstate highway completed in Tennessee. [ 28 ] On June 30, 1972, the final stretch of I-40 entirely within Arkansas, located between Clarksville and Ozark was opened; [ 29 ] the last section to open in the state was the Hernando de Soto ...