The shape and color of a route number sign indicate the type of roadway.

The shape and color of a route number sign indicate the type of roadway you are on and help you follow the correct path to your destination.

- U.S. Routes are marked with black numbers on a white background and shaped like a shield. These roads are part of the national highway system.
- Interstate Highways use red, white, and blue shield-shaped signs, with red at the top, blue at the bottom, and white numbers in the center.
- State Route signs vary in shape and design depending on the state. Each state uses its own style, often reflecting local symbols or numbering systems.

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