King County Department of Transportation

Find King County Washington departments of transportation, highways, roads, and bridge departments. Departments of transportation provide information on public transport, including roads, highways, bridges, traffic conditions, closures, tolls and travel information.


King County Transportation 201 South Jackson Street Seattle WA 98104 206-296-6590


Seattle Department of Transportation 700 5th Avenue Seattle WA 98104 206-684-7623

Seattle Department of Transportation 15700 Dayton Avenue North Shoreline WA 98133 206-440-4000

US Transportation Department Seattle 915 2nd Avenue Seattle WA 98174 206-220-7754

Washington State Department Of Transportation 6431 Corson Avenue South Seattle WA 98108 206-768-5700

Washington State Department of Transportation 3241 118th Avenue Southeast Bellevue WA 98005 425-649-4429

Washington State Department of Transportation 10833 Northup Way Bellevue WA 98004 425-739-3730

Transportation Departments by City

About Transportation Departments

How does the United States pay for transportation infrastructure and improvements?

The major source of funding for federal highway and transit investment is the Highway Trust Fund. The fund receives revenues from gasoline and other motor fuel taxes and from taxes on heavy trucks and truck tires.

How does electronic toll collection work for drivers that don't have a transponder?

Some states have transitioned to electronic tolls and do not provide lanes for paying tolls by cash. Many states have installed license plate recognition systems for vehicles that do not have a transponder and thus are not equipped for electronic toll collection. This system records the vehicle's license plate as it passes through the toll and generates a bill based on the vehicle's registration information.

Why does highway or road construction take place during the day in some places and at night in other locations?

Highway and road construction schedules are based on a number of different factors, including the safety of workers and the public, the impact on motorists through the work zone, and the impact on area schools and hospitals.