Interstate highways are indicated by which shield design on road signs?

• A. White shield.
• B. Blue shield with a red band on top.
• C. Green shield.
• D. Brown shield.

Answer: (B)

Sign shape and color are used to identify different highway systems, and the Interstate shield is a distinctive symbol that drivers learn to recognize. The Interstate system uses a blue shield with a red band across the top, creating a bold, high-contrast mark that stands out on fast-moving roads. The red band signals the word “Interstate” often shown above the numbers, while the blue field carries the route number in white, making the sign quickly identifiable from a distance. This consistent design across all states helps drivers know immediately they’re on a nationwide, high-speed, limited-access route, no matter where they are. Other sign colors and shapes indicate different systems, such as state highways or parks, so the blue shield with a red top uniquely identifies the Interstate system.