Regional Transit Expansion: Sound Transit 3

A sound tomorrow starts today
Sound Transit has begun the process to shape a Sound Transit 3 (ST3) ballot measure that voters will consider in November 2016. ST3 will build upon the existing mass transit system of light rail, commuter rail and bus services to take people further and faster to destinations throughout King, Snohomish and Pierce counties.

Sound Transit 3 is critical to improving mobility in our region. Congestion reduces our quality of life and without action it will get worse. By 2040, the region will have nearly a million more residents - an increase of 30 percent - and support more than a million new jobs, greatly increasing travel demand. Congestion also hurts our economy, and with the Central Puget Sound region responsible for 70 percent of Washington's economic activity, improving our region's transportation system is critical to the state's economic well-being.

The Sound Transit Board is responding to overwhelming support from residents to keep the region's people and economy moving in the years ahead. In addition to helping transit users, expanding mass transit also benefits both commuters and freight by freeing up road capacity. It is the best way, and often the only way, to significantly increase the capacity of the region's most congested corridors. 

To learn more about ST3, including project updates, visit