Davis, CA 14 % of people ride to work
Davis, CA Road Fatality Rate:  1 per 100,000
Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population 0.0 17.3
Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population
 
Risk of Fatality (Fatalities as % of Injuries)   California Cities of 40,000 to 120,000
 
Adapted from Stephen Marshall Pre-1950’s Post-1950’s Evolution of the Street Network
 
 
FHA Technical Bulletin No. 7 (1938) Planning Profitable Neighborhoods
<ul><li>According to the FHA the grid layout was </li></ul><ul><li>Monotonous </li></ul><ul><li>Had Little Character </li>...
Street network,  safety and  sustainability  in 24 medium sized California cities Cities selected to represent a range of ...
 
<ul><li>Shape and Configuration </li></ul><ul><li>Network Scale </li></ul><ul><li>Network Connectivity </li></ul>
Citywide Street Network Neighborhood Street Network Linear Tree Grid Tributary Radial Grid Tree Adapted from Stephen Marsh...
550 Intersections per Square Mile Network Scale
110 Intersections per Square Mile Network Scale
45 Intersections per Square Mile Network Scale
Link-to-Node Ratio = 1.61  Link-to-Node Ratio = 1.13  Link-to-Node Ratio = 1.16  Network Connectivity
<ul><li>Street Network Properties </li></ul><ul><li>Street Design Properties </li></ul><ul><ul><li>Average Total Number of...
Safety Analysis Based on Geo-coding  230,000  Accident Records in 24 California Cities
Safety and Travel Choice Analysis done for  1040  Census Block Groups  24 California Cities
Travel Choice Based on Census Data 1040 Census Block Groups, 24 California Cities
versus
versus Safety Risk of Severe Injury or Fatality Chance of being Severely Injured  30%  Higher Chance of being Killed  50% ...
Odds of Dying in a Road Accident  based on Intersection Density 1 in 200 1 in 500
Percentage of People  Walking,  Biking  or   Taking Transit
Percentage of People  Walking,  Biking  or   Taking Transit Effect of Intersection Density for Cul-de-sac Network
Percentage of People  Walking,  Biking  or   Taking Transit Effect of Intersection Density for Gridded Network
Thanks to US EPA and CNU
28,000 14,000 8,000
15,000 11,000 14,000 11,000
8,346 10,524 12,831 8,600 2,461 28,820 7,518 6,774
16,186 10,364 13,154 24,283 5,898 15,547 17,107
Davis: Response Time 14.9 mph 14.2 mph 12.7 mph
 
 
 
 
Downtown Hartford 1960 to 2000 Parking
City of Hartford 1960 to 2000 Population and Employment
Evolution of Network in California Cities
Norman W. Garrick
Norman W. Garrick 11 X 2 X
 
Norman W. Garrick Sustainability Gap USA Norway Daily Miles Traveled For every man,  woman and child
 
Working on Detroit
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Street Networks: Traffic Safety, Travel Mode Choice and Emergency Services

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Norman Garrick compares street network design from pre-1950 and post-1950, factors that help determine the overall safety of safe pedestrian travel, and explains why it is so obvious that the pandemic of sprawl development is to blame for unsafe, poorly designed, disconnected neighborhoods. Studies prove that Street Network Design has an integral role in providing safe, pedestrian friendly,and highly accessible communities. We must re-think the suburban model in order to reform emergency response.

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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.
  • Street Networks: Traffic Safety, Travel Mode Choice and Emergency Services

    1. 2. Davis, CA 14 % of people ride to work
    2. 3. Davis, CA Road Fatality Rate: 1 per 100,000
    3. 4. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population 0.0 17.3
    4. 5. Road Fatality Rate for All 157 California Cities Over 40,000 number per 100,000 population
    5. 7. Risk of Fatality (Fatalities as % of Injuries) California Cities of 40,000 to 120,000
    6. 9. Adapted from Stephen Marshall Pre-1950’s Post-1950’s Evolution of the Street Network
    7. 12. FHA Technical Bulletin No. 7 (1938) Planning Profitable Neighborhoods
    8. 13. <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>
    9. 14. Street network, safety and sustainability in 24 medium sized California cities Cities selected to represent a range of traffic safety level
    10. 16. <ul><li>Shape and Configuration </li></ul><ul><li>Network Scale </li></ul><ul><li>Network Connectivity </li></ul>
    11. 17. Citywide Street Network Neighborhood Street Network Linear Tree Grid Tributary Radial Grid Tree Adapted from Stephen Marshall, Streets & Patterns
    12. 18. 550 Intersections per Square Mile Network Scale
    13. 19. 110 Intersections per Square Mile Network Scale
    14. 20. 45 Intersections per Square Mile Network Scale
    15. 21. Link-to-Node Ratio = 1.61 Link-to-Node Ratio = 1.13 Link-to-Node Ratio = 1.16 Network Connectivity
    16. 22. <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
    17. 23. Safety Analysis Based on Geo-coding 230,000 Accident Records in 24 California Cities
    18. 24. Safety and Travel Choice Analysis done for 1040 Census Block Groups 24 California Cities
    19. 25. Travel Choice Based on Census Data 1040 Census Block Groups, 24 California Cities
    20. 26. versus
    21. 27. versus Safety Risk of Severe Injury or Fatality Chance of being Severely Injured 30% Higher Chance of being Killed 50% Higher
    22. 28. Odds of Dying in a Road Accident based on Intersection Density 1 in 200 1 in 500
    23. 29. Percentage of People Walking, Biking or Taking Transit
    24. 30. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Cul-de-sac Network
    25. 31. Percentage of People Walking, Biking or Taking Transit Effect of Intersection Density for Gridded Network
    26. 32. Thanks to US EPA and CNU
    27. 33. 28,000 14,000 8,000
    28. 34. 15,000 11,000 14,000 11,000
    29. 35. 8,346 10,524 12,831 8,600 2,461 28,820 7,518 6,774
    30. 36. 16,186 10,364 13,154 24,283 5,898 15,547 17,107
    31. 37. Davis: Response Time 14.9 mph 14.2 mph 12.7 mph
    32. 42. Downtown Hartford 1960 to 2000 Parking
    33. 43. City of Hartford 1960 to 2000 Population and Employment
    34. 44. Evolution of Network in California Cities
    35. 45. Norman W. Garrick
    36. 46. Norman W. Garrick 11 X 2 X
    37. 48. Norman W. Garrick Sustainability Gap USA Norway Daily Miles Traveled For every man, woman and child
    38. 50. Working on Detroit

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