What is the purpose of an Interstate highway sign?

The purpose of an Interstate highway sign is to indicate the route number and provide directions on interstates. These signs play a crucial role in guiding drivers along the highway system, which connects different states and facilitates long-distance travel. The signs are designed with specific colors and shapes that make them easily recognizable, ensuring that motorists can quickly identify the interstate routes they are traveling on or need to join. This helps in navigation and planning routes, especially during long road trips or when trying to reach specific destinations connected by the interstate system.