Rating Infrastructure for Pedestrian Safety

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By Dr. Said Dahdah, World Bank (Washington, D.C., USA)

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Rating Infrastructure for Pedestrian Safety

  1. 1. Transforming Transportation Pedestrian Safety and Public Transport for Vulnerable Populations, Januray 15, 2009 <ul><li>Infrastructure Safety Rating for Pedestrians </li></ul><ul><li>Said Dahdah </li></ul><ul><li>Road Safety Specialist </li></ul>
  2. 2. System user Problem of crashes System designer Problem of injury FROM FOCUS ON CRASHES TO FOCUS ON INJURIES
  3. 3. Swedish Road Administration
  4. 4. Swedish Road Administration
  5. 5. Vision Zero philosophy Integration and Separation. <ul><li>Vulnerable road users should not be exposed to motorised vehicles at speeds exceeding 30 km/h </li></ul><ul><li>If 1. cannot be satisfied then separate or reduce vehicle speed to 30 km/h </li></ul>
  6. 6. Why 30 km/h?
  7. 8. Risk Concept
  8. 9. Risk Model for Pedestrian Crashes Along Crossing Pedestrian Likelihood Protection Area Factor Likelihood Protection Area Factor
  9. 10. Likelihood of Pedestrian Crashes <ul><li>Likelihood Factor for “walking along” the road crashes = </li></ul><ul><li>Speed factor x Sidewalk provision factor x Side friction factor </li></ul>
  10. 11. Likelihood of Pedestrian Crashes
  11. 12. Likelihood of Pedestrian Crashes <ul><li>Likelihood Factor for “crossing” the road crashes = </li></ul><ul><li>Speed factor </li></ul><ul><li>x Number of lanes for use by through traffic factor </li></ul><ul><li>x Median type factor </li></ul><ul><li>x Pedestrian crossing facilities factor </li></ul><ul><li>x Quality of crossing factor </li></ul>
  12. 13. Likelihood of Pedestrian Crashes
  13. 14. Likelihood of Pedestrian Crashes <ul><li>“ Walking Along” Crash Likelihood Factor =0.7 </li></ul><ul><li>“ Crossing” Crash Likelihood Factor = 3.6 </li></ul><ul><li>Ideal Road LF (both crash type) = 0.25 </li></ul>
  14. 15. Risk Concept
  15. 16. Severity of Pedestrian Crashes <ul><li>Severity Factor for Pedestrian Crashes = </li></ul><ul><li>Speed factor </li></ul><ul><li>X Age factor </li></ul><ul><li>X Vehicle type factor </li></ul>
  16. 17. Severity of Pedestrian Crashes
  17. 18. Safety Rating for Pedestrians <ul><li>Road Prevention and Protection Score (RPPS) = </li></ul><ul><li>Likelihood factor * Protection factor (Risk) </li></ul>
  18. 19. Safety Rating
  19. 20. Fatality Prediction Model <ul><li>Fatality/km = RPPS*Country Factor </li></ul><ul><li>*Exposure Factor*Traffic Flow </li></ul><ul><li>Country Factor = (Fatality/100 million veh-km)/RPPS </li></ul><ul><li>Exposure Factor = Pedestrian Flow Effect </li></ul><ul><li>(exponent 0.4) </li></ul>
  20. 21. Country Factor (China) China Country Factor = 2 (RPPS 1  2 Fatalities per 100 million veh-km)
  21. 22. Economic Analysis of Transport Projects <ul><li>Travel Time Saving </li></ul><ul><li>Vehicle Operation Cost </li></ul><ul><li>Why not Safety? </li></ul>

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