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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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44 results

SR 542 Deming Corridor Study

Location: SR 542
Timeline: January 2022-December 2022
  • In progress
  • Whatcom County

State Route 542,  Mount Baker Highway, connects communities in eastern Whatcom County with the rest of Washington State while also providing a gateway to outdoor recreation and tourism opportunities near Mount Baker. This route also acts as an economic corridor transporting over 3 million tons

SR 702 8th Avenue South Roundabout Pre-Design Study

Location: SR 702
Timeline: June - August 2021
  • Complete
  • Pierce County

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

Location: SR 900
Timeline: Summer 2020 - Winter 2023
  • In progress
  • King County

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 corridor

SR 99 Targeted Corridor Study

Location: SR 99
Timeline: Ongoing
  • In progress
  • Snohomish County

State Route 99 (Evergreen Way) in unincorporated Snohomish County is a heavily traveled corridor that serves as a major north-south alternative to I-5, and links Lynnwood, Everett and other growing communities in Snohomish County. The area lacks sidewalks and other pedestrian and transit safety

State Route 4 Corridor Planning Study

Location: SR 4
Timeline: Dec. 2019 - Early 2021
  • Complete
  • Cowlitz County

This planning study is intended to improve the overall connectivity and mobility in the study 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

Location: SR 167
Timeline: 2021-2023
  • In progress
  • Pierce County

The Tacoma to Puyallup Regional Trail will connect downtown Puyallup to Fife and downtown Tacoma, providing people who live and work in the area with a new option to travel without a motorized vehicle to a variety of destinations. Through this study, WSDOT will complete preliminary trail design

Tolling the SR 509 and SR 167 expressways

Location: SR 509, SR 167
Timeline: 2009 - 2013
  • Complete
  • King County
  • Pierce County

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 financial

Ultra-high speed rail study

Location:
Timeline: 2016-2028
  • In progress
  • Whatcom County
  • Skagit County
  • Snohomish County
  • King County
  • Pierce County
  • Thurston County
  • Lewis County
  • Cowlitz County
  • Clark County

WSDOT is studying how ultra-high-speed ground transportation (UHSGT) might serve as a catalyst to transform the Pacific Northwest. A stronger, better connected economic megaregion — stretching from greater Vancouver, British Columbia to metro Seattle, Washington to Portland, Oregon — has the

US 101 East Sequim Pre-Design Study

Location: US 101
Timeline: Summer 2021 - Summer 2022
  • Complete
  • Clallam County

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 195 Corridor Crash Analysis

Location: US 195
Timeline: January 2010 - January 2016
  • Complete
  • Spokane County
  • Whitman County

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 reduce

US 195 North/I-90 Transportation Study

Location:
Timeline: Spring 2018 - Ongoing
  • In progress

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

Location: US 2, SR 204
Timeline: 2016 - 2019
  • Complete
  • Snohomish County

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 Westbound Trestle Study

Location: US 2
Timeline: 2019 - 2021
  • Complete
  • Snohomish County

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

West Plains Subarea Transportation Management Plan Study, Phase 1, US 2 Vicinity

Location: US 2
Timeline: Fall 2019 - Ongoing study
  • In progress
  • Spokane County

The US 2 West Plains Sub-area Management Plan Phase 1, refines previous studies that have been 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/ I-90 interchange

Traction tires are a special type of tire

manufactured with at least 1/8 of an inch tread. Traction tires are usually marked with a mountain/snowflake symbol, the letters M+S or “All Season.”

Carry chains, practice before leaving

Requiring chains keeps traffic moving during storms rather than closing a pass or roadway.

Prep your car. Fill up your gas tank,

pack jumper cables, ice scraper, warm clothing, snacks and water.