Welcome to the Web site for the Expert Review Panel for Sound Transit Phase Three (ST3). Here you'll find information about the Panel's mission, members, meetings and findings, along with links to resources.

The Expert Review Panel, as required by state law, provides independent, expert technical review for the Phase 3 Plan Update being conducted by Sound Transit. The purpose of the plan is to develop recommendations for the expansion of the high-capacity transportation system in Pierce, King and Snohomish counties.