Seattle has ambitious growth plans, and despite traffic congestion throughout the city, there are no plans or opportunities to add motor vehicle capacity. To help Seattleites understand its future mobility needs, Nelson\Nygaard led an intensive stakeholder process that examined a broad array of corridors and used a multiple account evaluation approach to prioritize those that offered the greatest opportunity for high capacity transit service. The Transit Master Plan identified land use and programmatic changes necessary to make transit successful, including coordinated bicycle and pedestrian improvements. This data-driven, outcome-focused, stakeholder-led approach resulted in an unprecedented level of consensus on Seattle’s mobility future. The City is now moving forward on alternatives analyses in preparation for construction.