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Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication A Policy on Design Standards: Interstate System. For a certain highway to be considered an Interstate Highway, it must meet these construction requirements or obtain a waiver ...
The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the Interstate Highways in Michigan.. These highways are built to Interstate Highway standards, [6] meaning they are all freeways with minimum requirements for full control of access, design speeds of 50 to 70 miles per hour (80 to 113 km/h) depending on type of ...
11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
This section of highway was for many years marked as US 3 and "To I-93", but these have now been replaced with regular I-93 signs. The Federal Highway Act of 1973 exempts this 7.6-mile (12.2 km) stretch from the Interstate Highway standards that apply elsewhere, and this highway is considered to be I-93 for all practical purposes. [20]
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 ...
(The Center Square) — The Capital Area Road and Bridge District's planned project for Interstate 49 expansion and a new Mississippi River bridge in Baton Rouge remains on track despite shifts in ...
The Federal-Aid Highway Act of 1968 (Public Law 90-495; 82 Stat. 815) is legislation enacted by the United States Congress and signed into law on August 24, 1968, which expanded the Interstate Highway System by 1,500 miles (2,400 km); provided funding for new interstate, primary, and secondary roads in the United States; explicitly applied the environmental protections of the Department of ...