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Delivering a first-rate transportation system for Seattle Scott Kubly, Director







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Alaskan Way Viaduct and Seawall Replacement Project (WSDOT)
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Introduction to the Briefing Book

This briefing book is designed to provide a consistent set of background information that can provide a framework for considering any transportation alternative. The briefing book provides information about how the transportation system works today, as well as what is known or projected about the future, and how other cities have handled similar challenges.

The Briefing Book is divided into thirteen sections, each organized around a central theme. The sections are:

Introduction – Describes the Urban Mobility Plan process and its relationship to the Collaborative Process.

Traffic and Congestion – Provides information about the causes and general solutions to traffic congestion, and provides information about the concept of “complete streets”. This section also includes two case studies, looking at how people responded to closures of the Bus Tunnel and closures on I-5 in Seattle.

Transportation in Center City Today – Provides complete information about the use of all modes in Center City, as well as historic trends for use of I-5 and the viaduct.

What we Know About the Future – Describes planned transportation investments and looks at anticipated growth and changes in land use that will affect travel behavior.

Surface and Transit Goals, Objectives and Measures (pdf coming soon) An initial set of Guiding Principles was presented to the Stakeholder Advisory Committee in January. These principles will be further defined with specific performance measures which will be added to the briefing book in the future.

Case Studies in Urban Freeway Removals – Looks at seven cities that have either removed or resisted building freeways in their downtown areas and identifies lessons they might offer for Seattle.

Best Practices in Transportation Demand Management – Documents some of the best practices in Transportation Demand Management, lessons learned that can be applied to Seattle, and provides a basis for understanding how these policies could be part of an overall systems solution. Transportation Demand Management includes a wide range of policy changes designed to provide incentives for reducing travel by single occupant autos.

Best Practices in Bicycle and Pedestrian Travel – Provides best practices examples of ways to increase the use of non-motorized modes, with specific applications to Seattle. A multimodal city will increasingly rely on pedestrian and bicycle travel, especially for shorter trips within Center City.

Best Practices in Transit – Looks at best practices in transit and suggests ways to maximize transit use in Seattle. All of the alternatives being considered for replacement of the existing viaduct will include improvements to the transit system.

Best Practices in Freight Movement – Identifies alternatives being considered in other cities for keeping freight moving in a multi-use constrained area, with lessons learned for Seattle. Moving goods throughout the city and maintaining the vitality of the Port and other industrial uses along the waterfront is a critical component of any alternative.

Economics of Transportation – Assesses the potential impact of transportation system decisions on the economy of the region.

Urban Ecology – Provides information relating potential transportation improvements to broader environmental and public health goals for the city and region.

Relationship to Other Projects and Policies – Summarizes the relationship between the alternatives for the Alaskan Way Viaduct replacement and other projects, policies and studies that may impact this decision.

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