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The plan for the United States Numbered Highway System was approved by the American Association of State Highway Officials.
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United States Numbered Highway System
Highway system of the United States of America
The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal…Source: Wikipedia (CC BY-SA)
American Association of State Highway and Transportation Officials
Transportation association
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the…Source: Wikipedia (CC BY-SA)