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Find detailed reviews about specific areas of Washington’s transportation system in our collection of planning studies.
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78 results
SR 702 8th Avenue South Roundabout Pre-Design Study
WSDOT is replacing the existing two-way stop at the intersection of State Route 702 and 8th Avenue South with a modern roundabout. The intersection currently has stop control on the northbound and southbound legs, and a span wire mounted, four-head flashing beacon. This project will remove the
SR 900 - Martin Luther King Jr. Way South Corridor Study
State Route 900/Martin Luther King Jr. Way South in Skyway is a heavily-traveled commuter corridor with approximately 32,000 vehicles using this section each day. However, it lacks complete sidewalks for pedestrian connectivity between residences and community hubs. We are conducting a
SR 99 Lynnwood and Unincorporated Snohomish County Pre-design Study
The State Route 99 Lynnwood and Unincorporated Snohomish County Pre-Design Study (SR 99 Study) focused on SR 99 between 212th Street Southwest and Airport Road in Lynnwood and unincorporated Snohomish County. The purpose of the SR 99 Study included:
- Identifying long- and near-term
State Route 4 Corridor Technical Report
This report is intended to improve the overall connectivity and mobility in the report area, increase safety by reducing potential conflicts between modes and to enhance economic vitality opportunities supported by the previously mentioned goals.
Tacoma to Puyallup Regional Trail
The spuyaləpabš Trail, formerly referred to as the Tacoma to Puyallup Regional Trail, will be a 12-mile regional shared use path that connects downtown Puyallup to Fife and downtown Tacoma. It will provide people who live and work in the area with a new option to travel without a motorized
Tolling the SR 509 and SR 167 expressways
At the request of the Washington State Legislature, WSDOT prepared toll feasibility studies for SR 167 and SR 509 to examine tolling and construction options for the new SR 167 and SR 509 corridors. The studies provided insights into:
- Potential funding and corresponding
Transportation Resilience Improvement Plan (TRIP) study
The TRIP will help state decision-makers prioritize immediate and long-term investments to address climate and natural hazards such as flooding, wildfire, landslides and earthquakes. These hazards could disrupt transportation networks and make it difficult for our communities to get services
US 101 East Sequim Pre-Design Study
US 101 connects Sequim, a city in Clallam County, with the rest of western Washington. It is a vital link for residents, businesses and visitors. The pre-design study identified roadway improvements focused on safety, access and improving travel times using the
US 101 Humptulips, Neilton, and Amanda Park Paving and Complete Streets - Pre-design
The purpose of this project is to preserve and extend the service life of the roadway. Due to the project’s location Complete Streets elements were included. Complete Streets is an approach to planning, designing, building, operating and maintaining streets that provide comfortable facilities
US 101 Paving Pre-design Study
Two segments of US 101 are scheduled to be repaved. Segment one is near Port Angeles from East Kolonels Way to Shore Road. Segment two spans Carlsborg and Sequim from Kitchen-Dick Road to Simdars Road.
This pre-design study completed a
US 101 Raymond Corridor Management Plan Study
Emergent Needs funds were used for this study. The study documents community feedback related to challenges when crossing the highway, including concerns about driver yielding behavior at crosswalks. The City of Raymond requested that WSDOT evaluate potential improvements on US 101. This
US 12 Naches Active Transportation Corridor Study
The Town of Naches, the Yakima Valley Conference of Governments (YVCOG) and WSDOT are working together to provide a safe, reliable and effective transportation network for drivers, cyclists and pedestrians along the US 12 corridor in Naches, Washington.
The study area included the US 12
US 12/Old Highway 9 Roundabout Pre-design Study
This pre-design sought feedback on a roundabout concept for the intersection of US 12 and Old Highway 9 in southwest Thurston County.
In April 2025, WSDOT met with local agencies. In May 2025, WSDOT conducted an online open house. The purpose of this engagement was to gather feedback about
US 195 Corridor Crash Analysis
The US 195 Corridor Crash Analysis is a traffic safety study that focuses on:
- Identifying the most common circumstances or trends that contribute to serious and fatal injury crashes along the corridor.
- Identifying low-cost solutions or countermeasures most likely to
US 195 North/I-90 Transportation Study
Create a more resilient and connected network for local trips between Hatch Road and I 90.
Improve safety for all and preserve capacity on US 195 for regional trips.
Extend the life of the US 195/I-90 interchange.
Provide more connections for walking, biking, and using
US 2 - SR 204 - 20th Street SE Interchange Justification Report
The population of Snohomish County has more than doubled since 1980 and is expected to gain another 200,000 residents by 2035. This growth will add pressure to the county’s high-traffic routes, including the US 2, SR 204 and 20th Street Southeast interchange, which already experiences severe
US 2 - West Plains Subarea Transportation Management Plan Study
The US 2 West Plains Sub-area Management Plan Phase 1, refines previous studies that have been previously completed in the West Plains area. This "live" study addresses the mobility gaps (congestion) that have already been identified along this 8-mile, east-west corridor between the US 2
US 2 Westbound Trestle Study
The study helps identify transportation issues, environmental concerns, community values and economic goals early in project planning. A detailed environmental review process follows a PEL study, as required by the national and state environmental policy acts. Information gathered in the PEL
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Expect delays, leave early or take an alternate route if possible; no appointment is worth risking someone’s life.