State highways in Washington
| State Highways in Washington | |
|---|---|
| Standard route signage in Washington | |
Map of Washington's highways | |
| System information | |
| Length | 7,000 mi (11,000 km) |
| Notes | Defined by RCW 47.17; maintained by WSDOT |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US X) |
| State | State Route X (SR X) |
| System links | |
The State Highways of Washington in the U.S. state of Washington comprise a network of over 7,000 miles (11,270 km) of state highways, including all Interstate and U.S. Highways that pass through the state, maintained by the Washington State Department of Transportation (WSDOT). The system spans 8.5% of the state's public road mileage, but carries over half of the traffic. All other public roads in the state are either inside incorporated places (cities or towns) or are maintained by the county. The state highway symbol is a white silhouette of George Washington's head (whom the state is named after).