Transit-Plus Multimodal Corridor Program

Updated: May 21, 2019

Program Description

The Transit-Plus Multimodal Corridor program is part of the 2015 voter-approved Levy to Move Seattle. The goal of the program is to improve mobility along 7 high-priority transit corridors by making a variety of transit and multimodal improvements. Theses corridor were identified by the Transit Master Plan as important corridors to improve mobility throughout the city.

SDOT will partner with King County Metro to make RapidRide improvements on some of these corridors, consistent with Metro’s RapidRide program and budget.

The Levy to Move Seattle provides partial funding for the Transit-Plus Multimodal Corridor program. SDOT is pursuing grant funding and working with Metro to partner on investments. The Transit-Plus Multimodal Corridor program is also coordinating with other levy-funded programs to deliver investments, such as paving, on these corridors.

Program Update: Levy Assessment

SDOT completed a comprehensive assessment of the Levy to Move Seattle in summer 2018. This assessment included a review of original levy commitments and an evaluation of the scope, schedule, cost and funding assumptions for each program within the levy. As part of this assessment, SDOT worked with the Transit Advisory Board and Levy Oversight Committee to review the Transit-Plus Multimodal Corridor program.

There were several program-specific findings:

  • The levy commitment was based on the project budgets included in the Move Seattle 10-year Strategic Vision. In the time since those budgets were developed, the program scope, extents and public expectations have increased but the budget remained the same. With current funding secured and likely leverage, SDOT will not be able to deliver the full scope of investments that align with the mobility needs of our growing city or meet community expectations.
  • SDOT can deliver transit and safety improvements on all 7 Transit-Plus Multimodal Corridors. Improvements will vary by corridor.
  • Delivery of RapidRide is dependent upon a partnership with King County Metro. Metro is in the process of developing a delivery program and budget.
  • Recent experience has shown that it is taking longer to secure grant funding on the federal, state and local levels.

Based on these findings and engagement with the Transit Advisory Board and Levy Oversight Committee, the outcomes of this assessment for the Transit-Plus Multimodal program include:

  • Continued commitment to deliver transit and multimodal improvements to all 7 corridors by 2024, within the levy timeframe. Investments will focus on improving transit speed and reliability, with access and safety improvements as funding allows.
  • Continue to advance delivery of RapidRide and more extensive multimodal improvements on as many corridors as possible, contingent upon a partnership with King County Metro and securing additional funds.

For more information about the levy assessment and other levy funded programs, please see the August 23 presentation to the Levy Oversight Committee.

As a result of the levy assessment, SDOT has identified two levels of corridor investment and updated project timelines.

RapidRide and Multimodal Improvements

SDOT and King County Metro will partner on improvements to make transit service more frequent, reliable and high-quality. This includes investments like:

  • Bus lanes, transit signal priority and off-board fare payment to speed up buses.
  • RapidRide stations with real-time information and weather protection.
  • More frequent and reliable bus service day and night.

As part of these projects, SDOT may also deliver multimodal improvements like repaved roads, pedestrian access and safety improvements, bicycle facilities, signal improvements, and other street or utility upgrades.

SDOT and King County Metro are currently working to make RapidRide investments to the following corridors consistent with past SDOT planning work and King County Metro’s RapidRide program.

For the RapidRide G and RapidRide Roosevelt Line, this level of investment is contingent upon securing Federal Transit Administration Small Starts funding and other grant funding. SDOT has been working with the FTA to secure these funds. However, this funding is not guaranteed.

Transit Speed, Reliability, and Access Improvements

SDOT will make targeted investments to improve the speed and reliability of current transit service. Elements could include bus lanes, transit signal priority, or other changes to the street to prioritize transit service. Transit access and safety improvements may also be included as funding allows. Based on the levy assessment, the following corridors are planned to receive this level of investment.

  • Rainier Corridor – Route 7, Downtown Seattle to Mt Baker to Rainier Beach
    • Note: SDOT currently plans to deliver corridor improvements to the Rainier Corridor in 2022 ahead of King County Metro. King County’s proposed budget includes funding to upgrade this corridor to RapidRide in 2024. SDOT and Metro are working together to assess joint delivery options.
  • Market Corridor – Route 44, Ballard to Wallingford to U-District
  • Fremont Corridor – Route 40, Downtown Seattle to Fremont/Ballard to Northgate
  • 23rd Ave Corridor – Route 48, Mt Baker to Central Area to U-District


The table below includes the updated corridor schedule based on the levy assessment. Learn more about individual Transit-Plus Multimodal Corridors by visiting their project websites, linked below.

Transit-Plus Multimodal CorridorStatusOpening Year*
RapidRide G Line
Downtown Seattle to First Hill to Madison Valley
Design 2022
RapidRide H Line
Downtown Seattle to Delridge to Burien
Design 2021
RapidRide Roosevelt Line
Downtown Seattle to Eastlake to Roosevelt
Design 2024
Downtown Seattle to Mt. Baker to Rainier Beach
Planning 2022
Ballard to Wallingford to U-District
Pre-planning 2023
Downtown Seattle to Fremon/Ballard to Northgate
Not active yet 2024
Mt. Baker to Central Area to U-District
Not active yet 2023

* Opening dates for lines planned in the SDOT Transit-Plus Multimodal Corridor program and the King County Metro RapidRide program are pending available funding. Additional information will be provided in coordination with King County Metro’s final budget in late 2018 and as information about other grant sources becomes available.

Program Library

How can I get involved?

We’ll be working with communities during the planning, design, and construction phases of each new Transit-Plus Multimodal corridor. For each new corridor, we’ll share data, ask for your feedback, and show how community input has been incorporated into the design.

Sign up for Transit-Plus Multimodal Corridor Program email updates