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Numbered highways in the United States

Book review

1:03

How are Interstate Highways Numbered?

Book adaptation

3:01

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1:32

How do they number those interstates?

Highways in the United States are split into at least four different types of systems, Interstate Highways, U.S. Highways, state highways, and county highways. Highways are generally organized by a route number or letter. These designations are generally displayed along the route by means of a highway shield. Each system has its own unique shield design that will allow quick identification to which system the route belongs. Below is a list of the different highway shields used throughout the United States.