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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

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
Road Diets in Sunnyvale
  • Seven + Roads “Dieted”
  • Primarily 4 lane to 2 lane + TWLTL
  • Impetus
    • Community Concerns
    • Bikeway Network Expansion
how did roads get dieted
How Did Roads Get Dieted?
  • Location-Specific Concerns/Studies/Projects
  • Quick Decision, Opportunistic Projects
  • Planned, Studied, Designed Projects
location specific first generation diets
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
process
Process
  • Location-Specific Studies
  • Outreach to Effected Neighborhoods
  • Citizen-Driven Designs
    • Refuge Islands – Old San Francisco Road
    • No Bike Lanes
results
Results
  • No Traffic Impact Other than Island Crashes
  • Mixed Community Response
    • Bicyclists Hated
    • Islands Get Hit, Some People Don’t Like Them
    • Pavement Deterioration
second generation diets for bikeway expansion
“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
the bike opps road diet golden ratio
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
practical results of bike opps
Practical Results of Bike Opps
  • Underlying Justification, Basis for Operations and Capital Improvement Decisions
  • Proactive, Catalyst
what was catalyzed
What Was Catalyzed?
  • Modification of Roadway Geometry Following Pavement Projects
  • Grant Applications
  • Capital Project Programming
operations projects
Operations “Projects”
  • Geometric Changes Following Pavement Rehabilitation
  • Little/No Technical Confirmation of Opps Study
  • No Public Input
  • Opportunistic
results of operations projects
Results of Operations Projects
  • Successful Operationally
  • Hurried “Designs”
    • Less than Optimal Geometry
    • Less than Optimal Traffic Signal Equipment Placement
  • Some Public Backlash
planned scheduled designed capital projects
Planned, Scheduled, Designed Capital Projects
  • Attractive Grant Opportunities
  • Follow-on Study of Intersection, Operational Impacts
  • Public Outreach
  • Well Developed Designs
results18
Results
  • Next to No Public Outcry
  • Expensive
  • Operationally Successful
  • Defensible Projects
  • Public Interest in Road Diets is Growing
conclusions
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