Interstate Highway standards

Blank markers used for one- and two-digit (left) or three-digit and suffixed (right) Interstates

Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) with several publications such as the 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 from the Federal Highway Administration.

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