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There Are Many Ways to Put A Road on a Diet

There Are Many Ways to Put A Road on a Diet. Jack Witthaus Sunnyvale Transportation & Traffic Manager jwitthaus@ci.sunnyvale.ca.us. Road Diets in Sunnyvale. Seven + Roads “Dieted” Primarily 4 lane to 2 lane + TWLTL Impetus Community Concerns Bikeway Network Expansion.

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There Are Many Ways to Put A Road on a Diet

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  1. There Are Many Ways to Put A Road on a Diet Jack Witthaus Sunnyvale Transportation & Traffic Manager jwitthaus@ci.sunnyvale.ca.us

  2. Road Diets in Sunnyvale • Seven + Roads “Dieted” • Primarily 4 lane to 2 lane + TWLTL • Impetus • Community Concerns • Bikeway Network Expansion

  3. How Did Roads Get Dieted? • Location-Specific Concerns/Studies/Projects • Quick Decision, Opportunistic Projects • Planned, Studied, Designed Projects

  4. Location Specific, “First Generation” Diets • Pre-Livable Community, Bike Network Movements • Driven by Community Concerns • Safety Concerns (Not Safety Issues) • Pedestrian Safety • Bike Safety • Speed, Volume of Vehicles

  5. Process • Location-Specific Studies • Outreach to Effected Neighborhoods • Citizen-Driven Designs • Refuge Islands – Old San Francisco Road • No Bike Lanes

  6. Results • No Traffic Impact Other than Island Crashes • Mixed Community Response • Bicyclists Hated • Islands Get Hit, Some People Don’t Like Them • Pavement Deterioration

  7. “Second Generation” Diets for Bikeway Expansion • Bicycle Opportunities Study – 1998 • Citywide Bike Lane Study of Arterials and Collectors • Methods Studied • Geometric Changes • Parking Modification/Removal • Road Widening • Travel Lane Removal

  8. The Bike Opps Road Diet “Golden Ratio” • Uncongested Travel Lane Capacity= 360 Vehicles per Hour • Free Flow Capacity 1800 VPH • Reduced to 1200 VPH to Account for Traffic Fluctuation, Future Growth • Reduced to 360 VPH Assuming 30% Green Time in Non-Free Flow Conditions

  9. Practical Results of Bike Opps • Underlying Justification, Basis for Operations and Capital Improvement Decisions • Proactive, Catalyst

  10. What Was Catalyzed? • Modification of Roadway Geometry Following Pavement Projects • Grant Applications • Capital Project Programming

  11. Operations “Projects” • Geometric Changes Following Pavement Rehabilitation • Little/No Technical Confirmation of Opps Study • No Public Input • Opportunistic

  12. Results of Operations Projects • Successful Operationally • Hurried “Designs” • Less than Optimal Geometry • Less than Optimal Traffic Signal Equipment Placement • Some Public Backlash

  13. Planned, Scheduled, Designed Capital Projects • Attractive Grant Opportunities • Follow-on Study of Intersection, Operational Impacts • Public Outreach • Well Developed Designs

  14. Results • Next to No Public Outcry • Expensive • Operationally Successful • Defensible Projects • Public Interest in Road Diets is Growing

  15. Conclusions • “Fat” Roads Exist • Road Diets Can Be Successful • Operationally • Public Acceptance • Diligence in Project Planning and Design Helps • Do Comprehensive Area-Wide Planning • Do Comprehensive Capital Project Engineering and Outreach

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