Safety Impacts of Access Management: Two Case Studies

• Authored by:  Peter Hsu
• Co-authored by:  W. T. Bowman
• Event:  2010 National Conference on Access Management

Presentation Outline

• Case Study 1-Nebraska Avenue Lane Diet
  • Before: 4-lane undivided
  • After: 2-lane divided with TWLTL
• Case Study 2-Hillsborough Avenue Median Installation
  • Before: 6-lane with TWLTL
  • After: 6-lane with raised medians

Case Study 1: Discussion

• Significant Safety Improvement
• Improvement of all Analyzed Crash Types
• From Worse to Better than SW Average
• Exceeded CRF Expectation
• Better Parcel Access
• Did not Significantly Impact Capacity
• Results May not Be Typical

Case Study 2: Discussion

• Significant Safety Improvement
• Improvement of Most Crash Types
• Still above SW Average (32% improvement)
• Exceeded CRF Expectation
• More Controlled Parcel Access
• Continue to Monitor Bike/Ped