Safety Effects of Median Modification Using Quick Kurb (QK)

Abstract:

Conclusions & Recommendations

  • Effective Temporary Median Treatment
  • Construction: Shorter Time and Less Cost
  • Safety Effects
  • Reduction on Left-Turn Related Crashes
  • Total Crashes: Reduced for most of applications except full median closure from bi-directional median opening
  • Benefit/Cost Ratio
  • Bi-directional Channelization: 8-12
  • One-directional Channelization: 3-5

 

Limitations & Next Step

  • Short “After Period” in the Study
  • Several Months to Three Years
  • Small Sample Size
  • Naïve Before-After Study:
  • No SPF for Bi-directional Left-Turn Bays

Next Step:

  • More Crash Data Collection
  • SPF for Bi-directional Left-Turn Bays
Slide List:
  1. Safety Effects of Median Modification Using Quick Kurb (QK)
  2. Background
  3. Traditional Median Closure
  4. New Median Closure Method
  5. Applications of  QK
  6. Main Components of QK
  7. Installation Procedure for QK
  8. QK on I-10 in California
  9. QK on I-10 in California (Cont’d)
  10. QK Usage in Florida
  11. Awards for the QK Applications
  12. Candidate Locations Selection
  13. QK Projects in Florida
  14.  
  15. Bi-Directional Channelization on Full Median Open
  16. One-Directional Channelization on Full Median Open
  17. Semi-Median Closure on
    Bi-Directional Left-Turn Bay
  18. Full Median Closure on
    Bi-Directional Left-Turn Bay
  19. Right-Turn Lane Drop in Intersection Functional Area
  20. Data Collection
  21. Influential Area for QK Treatment
  22. Observational BA study
  23. Economic Performance Evaluation
  24. Two Observational BA Studies
  25. Naïve Before-After Study
  26. Crash Rates in Before & After Periods
  27. Naïve BA Study Results
  28. Empirical Bayesian Method
  29. Empirical Bayesian Method
  30. Safety Performance Function (SPF)
  31. SPF for Segment with Full Median Opening
  32. EB Evaluation Results
  33. Crash Cost Reduction
  34. Benefit/Cost Analysis
  35. Conclusions & Recommendations
  36. Limitations & Next Step
  • Posted on: Tue, 10/08/2013 - 15:34
  • By: shroedermay
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