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An Interstate Highway under construction , with both directions of traffic moved to one side of the roadway I-94 in Michigan, showing examples of non-interchange overpass signage in median, upcoming exit signage on right shoulder, a pre-1960 overpass with height restriction signage, newly installed cable median barrier, and parallel grooved ...
In addition, these toll facilities were grandfathered from Interstate Highway standards. A notable example is the western approach to the Benjamin Franklin Bridge in Philadelphia, where I-676 has a surface street section through a historic area. Policies on toll facilities and Interstate Highways have since changed.
The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.
I-70 briefly follows an at-grade portion of US 30 with traffic lights in Breezewood, Pennsylvania. There are gaps in the Interstate Highway System where the roadway carrying an Interstate shield does not conform to the standards set by the Federal Highway Administration (FHWA), the body that sets the regulations for the Interstate Highway System.
In the United States, future Interstate Highways include proposals to establish new mainline (one- and two-digit) routes to the Interstate Highway System.Included in this article are auxiliary Interstate Highways (designated by three-digit numbers) in varying stages of planning and construction, and the planned expansion of existing primary Interstate Highways.
In roadways, vertical clearance is the measurement from the ground or the road pavement to the bottom of overpasses or bridges. [2] [3]American Association of State Highway Officials (AASHO) established Interstate Highway standards which included minimum vertical clearance of 14 feet (4.3 m).
The Highway Beautification Act establishes regulations for the environments surrounding federal highways. [12] Interstate Highway standards are regulated by the American Association of State Highway and Transportation Officials. Road signs are standardized by the Federal Highway Administration in the Manual on Uniform Traffic Control Devices.
The standard article naming convention (where the page is located) for Interstate Highways is "Interstate [number]", and the convention for U.S. Highways is "U.S. Route [number]". State highway articles are generally titled in the form "[State] [road type] [number]" (e.g. Missouri Route 13, Oklahoma State Highway 3, New York State Route 17).