SR 520 – A Metaphor for Sustainability

1. SR 520 – A Metaphor for Sustainability From Engineering to CSS David Taylor, CNU, Senior Vice President National Director, Sustainable Transportation Solutions David.taylor@hdrinc.com

2. Context Sensitive Solutions (CSS) “Context sensitive solutions (CSS) is a collaborative, interdisciplinary approach that involves all stakeholders to develop a transportation facility that fits its physical setting and preserves scenic, aesthetic, historic and environmental resources, while maintaining safety and mobility. CSS is an approach that considers the total context within which a transportation improvement project will exist." FHWA

3. CSS – IN SUSTAINABILITY’S MAINSTREAM HDR offers sustainable transportation solutions that strive to address long-term environmental, social, and economic challenges by • Delivering context sensitive solutions • Helping create livable communities • Providing multi-modal transportation choices • Protecting and enhancing environmental resources • Supporting economic growth and social equity

4. SR 520 – METAPHOR for SUSTAINABILITY • HDR project with STS applications • Contextual analysis • Visioning • CSS • Integrated team design/charrette • Multi-modal - Auto/HCT/Ped/Bike • Reconnected fish passages • Wetlands restoration and mitigation • Bioswales and retention for water quality • GHG analysis • Health Impact Analysis • Sustainable materials/construction methods

5. SR 520 – FROM ENGINEERING to CSS • Original Assignment – An engineering concept • Revised Plan – A CSS-driven corridor concept • – Intensive background analysis • – Vision and strategy • – The design charrette • – Applied design elements • – The preferred concept • – Plan document

6. CHANGING THE TEAM • Typical Team – Multi-disciplinary • All disciplines • Civil to structures to planning to landscape architect and back to civil • Project meeting and start process all over again • New Team - Integrated • All disciplines represented • Work in studio environment • Simultaneous planning and design • Coordinated decision-making • Final plan review by CSS Coordinator

7. CONTEXT for SR 520

8. VISION STATEMENT Context To provide the region a cohesive, graceful travelway that respects and enhances the surrounding natural and built environments Character By creating structures and landscapes with high quality craftsmanship that reflect natural and contemporary character Connection That reconnects neighborhoods, communities and restore habitat

9. VISION DIAGRAM

10. STRATEGIC DIRECTION • The SR 520 total experience – Inside Out and Outside In • Inside Out - Design from the driver perspective • High Speed: Bold, simple forms • Slower Speed: Increasing detail • Very Slow Speed/Stop: Highly detailed • Outside In - Design from the community perspective • Sensitive views • Community relationships • Landscape and design applications

11. BIG IDEAS • “Air Land and Water” • Expressions • Geologic – Layers of soil connected to land forms (strata, rocks, soil) • Structural – Architectural bridge piers • Contemporary Naturalistic • Air - Reflects lightness • Water - Recalls flowing forms

12. Bridge Structures Retaining Walls DESIGN ELEMENTS Landscape Lids Railing/Fencing Sound Walls Barriers and Medians

13. Lighting Lighting Public Spaces DESIGN ELEMENTS Signs and Structures • Public Art Portals/Community Gateways

14. APPLICATION OF DESIGN ELEMENTS

15. ENGINEERED vs. DESIGNED

16. ENGINEERED vs. DESIGNED

17. SPECIALITY FORMLINERS Sound Wall – Land Sound Wall - Water

18. LIDS – RECONNECTING COMMUNITIES

20. SR 520 NEXT STEPS • Refining CSS • Active Community Collaboration • Formalize the decision-making process • Re-work the physical design space • Deepen Sustainability Applications • GHG/HIA Advisory Services • Composite/recycled materials • Sustainable site construction • Construction waste management

21. SR 520 – A Metaphor for Sustainability From Engineering to CSS David Taylor, CNU, Senior Vice President National Director, Sustainable Transportation Solutions David.taylor@hdrinc.com