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To learn about Sound Transit's current and planned projects explore the new System Expansion interactive map. This website is no longer being updated.

The ST3 plan would complete major mass transit extensions every few years over a 25-year period. To learn about specific project times, view the project phasing factsheet.  

The ST3 Plan recognizes that travelers in our region face increasing challenges daily, and mobility improvements need to be made right away. The plan includes an Early Deliverables Program that would focus on establishing relief in key corridors while longer-term projects are planned and constructed. The program includes, but is not limited to, Bus Rapid Transit (BRT) on I-405 and SR 522, capital investments on Metro’s RapidRide C and D lines to bring earlier improvements to Ballard and West Seattle, capital investments to increase bus speed and reliability on Pierce County routes and on Madison Street in Seattle.