Cnu Elgin Study February 2010

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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.
  • Cnu Elgin Study February 2010

    1. 1. Slaying the Sprawl Dragon
    2. 2. Source: Noah Radford Norman W. Garrick
    3. 3. Davis, CA 14 % of people ride to work
    4. 4. Davis, CA Road Fatality Rate: 1 per 100,000
    5. 5. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population 0.0 17.3
    6. 6. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population
    7. 8. Risk of Fatality (Fatalities as % of Injuries) California Cities of 40,000 to 120,000
    8. 10. Adapted from Stephen Marshall Pre-1950’s Post-1950’s Evolution of the Street Network
    9. 14. FHA Technical Bulletin No. 7 (1938) Planning Profitable Neighborhoods
    10. 15. <ul><li>According to the FHA the grid layout was </li></ul><ul><li>Monotonous </li></ul><ul><li>Had Little Character </li></ul><ul><li>Uneconomical </li></ul><ul><li>Posed Safety Concerns </li></ul>
    11. 16. Street network, safety and sustainability in 24 medium sized California cities Cities selected to represent a range of traffic safety level
    12. 18. <ul><li>Shape and Configuration </li></ul><ul><li>Network Scale </li></ul><ul><li>Network Connectivity </li></ul>
    13. 19. Citywide Street Network Neighborhood Street Network Linear Tree Grid Tributary Radial Grid Tree Adapted from Stephen Marshall, Streets & Patterns
    14. 20. 550 Intersections per Square Mile Network Scale
    15. 21. Network Scale 250 Intersections per Square Mile
    16. 22. 110 Intersections per Square Mile Network Scale
    17. 23. 45 Intersections per Square Mile Network Scale
    18. 24. Link-to-Node Ratio = 1.61 Link-to-Node Ratio = 1.13 Link-to-Node Ratio = 1.16 Network Connectivity
    19. 25. <ul><li>Street Network Properties </li></ul><ul><li>Street Design Properties </li></ul><ul><ul><li>Average Total Number of Lanes </li></ul></ul><ul><ul><li>Average Outside Shoulder Width </li></ul></ul><ul><ul><li>Raised Median </li></ul></ul><ul><ul><li>Painted Median </li></ul></ul><ul><ul><li>On-Street Parking </li></ul></ul><ul><ul><li>Bike Lanes </li></ul></ul><ul><ul><li>Raised Curbs </li></ul></ul><ul><li>Travel and Activity Level </li></ul><ul><li>Distance from City Center </li></ul><ul><li>Income </li></ul><ul><li>Mix of Land Use </li></ul>Variables included in Our Safety and Travel Choice Models
    20. 26. Safety Analysis Based on Geo-coding 230,000 Accident Records in 24 California Cities
    21. 27. Safety and Travel Choice Analysis done for 1040 Census Block Groups 24 California Cities
    22. 28. Travel Choice Based on Census Data 1040 Census Block Groups, 24 California Cities
    23. 29. versus
    24. 30. versus Safety Risk of Severe Injury or Fatality Chance of being Severely Injured 30% Higher Chance of being Killed 50% Higher
    25. 31. Odds of Dying in a Road Accident based on Intersection Density 1 in 200 1 in 500
    26. 32. Percentage of People Walking, Biking or Taking Transit
    27. 33. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Cul-de-sac Network
    28. 34. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Gridded Network
    29. 39. Downtown Hartford 1960 to 2000 Parking
    30. 40. City of Hartford 1960 to 2000 Population and Employment
    31. 41. Norman W. Garrick
    32. 42. Norman W. Garrick 11 X 2 X
    33. 44. Norman W. Garrick Sustainability Gap USA Norway Daily Miles Traveled For every man, woman and child
    34. 47. Why Reduce Car Use? More life More attractive downtown Give downtown a competitive edge
    35. 48. Making Connections
    36. 49. Denver, Colorado Norman W. Garrick 16 th Street Mall
    37. 50. Norman W. Garrick
    38. 51. Norman W. Garrick
    39. 52. Norman W. Garrick
    40. 53. Norman W. Garrick
    41. 54. Norman W. Garrick
    42. 55. Norman W. Garrick
    43. 56. Norman W. Garrick Community or Project?
    44. 57. Norman W. Garrick Will form follow function
    45. 58. Norman W. Garrick Integration of key

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