Washington State Route refers to a network of highways and roads that are maintained by the state of Washington. These routes facilitate transportation across the state, connecting cities, towns, and various regions. They are designated with a specific number and are crucial for both local and long-distance travel. The system includes major routes like Interstate 5 and State Route 99, which serve as key corridors for commerce and tourism. Each route is marked with signs that display the route number, helping drivers navigate efficiently. Overall, Washington State Route plays a vital role in the state's infrastructure.