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The Built Environment, Traffic Safety and Travel Choice
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The Built Environment, Traffic Safety and Travel Choice

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Dr. Norman Garrick, of the University of Connecticut's Center for Transportation and Urban Planning, on street connectivity and public safety.

Dr. Norman Garrick, of the University of Connecticut's Center for Transportation and Urban Planning, on street connectivity and public safety.

Published in Business , Technology
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  • To tame the street so all street users can share in its function for their specific needs, We have to reduce the vehicle operating speeds.

Transcript

  • 1.  
  • 2. Davis, CA 14 % of people ride to work
  • 3. Davis, CA Road Fatality Rate: 1 per 100,000
  • 4. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population 0.0 17.3
  • 5. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population
  • 6. Norman W. Garrick
  • 7.  
  • 8. Risk of Fatality (Fatalities as % of Injuries) California Cities of 40,000 to 120,000
  • 9.  
  • 10. Adapted from Stephen Marshall Pre-1950’s Post-1950’s Evolution of the Street Network
  • 11.  
  • 12.  
  • 13.  
  • 14. FHA Technical Bulletin No. 7 (1938) Planning Profitable Neighborhoods
  • 15.
    • According to the FHA the grid layout was
    • Monotonous
    • Had Little Character
    • Uneconomical
    • Posed Safety Concerns
  • 16. Street network, safety and sustainability in 24 medium sized California cities Cities selected to represent a range of traffic safety level
  • 17.  
  • 18.
    • Shape and Configuration
    • Network Scale
    • Network Connectivity
  • 19. Citywide Street Network Neighborhood Street Network Linear Tree Grid Tributary Radial Grid Tree Adapted from Stephen Marshall, Streets & Patterns
  • 20. 550 Intersections per Square Mile Network Scale
  • 21. 110 Intersections per Square Mile Network Scale
  • 22. 45 Intersections per Square Mile Network Scale
  • 23. Link-to-Node Ratio = 1.61 Link-to-Node Ratio = 1.13 Link-to-Node Ratio = 1.16 Network Connectivity
  • 24.
    • Street Network Properties
    • Street Design Properties
      • Average Total Number of Lanes
      • Average Outside Shoulder Width
      • Raised Median
      • Painted Median
      • On-Street Parking
      • Bike Lanes
      • Raised Curbs
    • Travel and Activity Level
    • Distance from City Center
    • Income
    • Mix of Land Use
    Variables included in Our Safety and Travel Choice Models
  • 25. Safety Analysis Based on Geo-coding 230,000 Accident Records in 24 California Cities
  • 26. Safety and Travel Choice Analysis done for 1040 Census Block Groups 24 California Cities
  • 27. Travel Choice Based on Census Data 1040 Census Block Groups, 24 California Cities
  • 28. versus
  • 29. versus Safety Risk of Severe Injury or Fatality Chance of being Severely Injured 30% Higher Chance of being Killed 50% Higher
  • 30. Odds of Dying in a Road Accident based on Intersection Density 1 in 200 1 in 500
  • 31. Percentage of People Walking, Biking or Taking Transit
  • 32. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Cul-de-sac Network
  • 33. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Gridded Network
  • 34. Evolution of Network in California Cities
  • 35. Norman W. Garrick 11 X 2 X
  • 36.  
  • 37. Norman W. Garrick Sustainability Gap USA Norway Daily Miles Traveled For every man, woman and child
  • 38.  
  • 39.  
  • 40.  
  • 41. 28,000 14,000 8,000
  • 42.  
  • 43.  
  • 44.  
  • 45. 15,000 11,000 14,000 11,000