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Use of Full Depth Shoulders on Wisconsin Highways

Use of Full Depth Shoulders on Wisconsin Highways. Steve Krebs, Bob Arndorfer, and Jed Peters – DTSD-Bureau of Technical Services April 29, 2013. Overview of presentation. Literature Review Current Design Practices Pavement Performance Observations

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Use of Full Depth Shoulders on Wisconsin Highways

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  1. Use of Full Depth Shoulders on Wisconsin Highways Steve Krebs, Bob Arndorfer, and Jed Peters – DTSD-Bureau of Technical Services April 29, 2013

  2. Overview of presentation Literature Review Current Design Practices Pavement Performance Observations Full Depth Shoulder (FDS) Construction and Cost Considerations FDS Life Cycle and Benefit-Cost Analyses Benefits Recommendations/Implementation Costs

  3. Literature Review • Design Standards • 1990 FHWA Advisory • Mechanistic-Empirical Pavement Design Guide • Wisconsin Highway Research Program (WHRP) Report • FDS Benefits • Construction Maintenance of Traffic • Incidents/Events • Emergency Evacuations • Other State Practices

  4. Current WisDOT Design Practices Geometry Thickness

  5. Pavement Performance Observations • Pavement Distress • NE Region • SE Region • NW Region • Preventative Measures

  6. FDS Construction and Cost Considerations - Overview • 10 Projects Analyzed • 8 Concrete Mainline • 2 HMA Mainline • As-built and Estimated FDS Costs

  7. FDS Construction and Cost Considerations – Cross-Sectional Assumptions

  8. FDS Construction and Cost Considerations – Cross-Sectional Assumptions

  9. Construction Cost Calculations

  10. Construction Cost Summary • Concrete Mainline Projects • As-built average (avg) cost: $182,920/mile • FDS HMA avg cost: $346,430/mile • FDS concrete avg cost: $265,000/mile • HMA Mainline Projects • As-built average (avg) cost: $123,320/mile • FDS HMA avg cost: $171,600/mile

  11. Life Cycle Cost Analysis (LCCA) - Overview • Costs/Impacts not Considered • Maintenance Schedules • Conventional • FDS • Time Value of Money

  12. LCCA– Summary • Concrete Mainline Projects • As-built avg net present value (NPV) life-cycle 50 year cost: $276,720/mile • FDS HMA avg NPV life-cycle 50 year cost : $428,310/mile • FDS concrete avg NPV life-cycle 50 year cost : $345,140/mile • HMA Mainline Projects • As-built avg NPV life-cycle 50 year cost : $198,050/mile • FDS HMA avg NPV life-cycle 50 year cost : $243,210/mile * NPV calculated with 3.5% discount rate

  13. SplitAxisLCCA Cash Flow

  14. Benefit Cost Analysis (BCA) • LCCA vs BCA • Dissimilar Alternative: User Delay • Conventional Shoulder User Delay NPV = $146,830/mile

  15. BCA– Summary • Concrete Mainline Projects • As-built avg NPV life-cycle 50 year cost: $423,550/mile • FDS HMA avg NPV life-cycle 50 year cost : $428,310/mile • FDS concrete avg NPV life-cycle 50 year cost : $345,140/mile • HMA Mainline Projects • As-built avg NPV life-cycle 50 year cost : $344,880/mile • FDS HMA avg NPV life-cycle 50 year cost : $243,210/mile * NPV calculated with 3.5% discount rate

  16. Additional Identified Benefits • Non-Denominated • IH-43 • IH-94 • Denominated • IH-39 – Shoulder Replacement • IH-94 – Shoulder Widening • USH 41 – Shoulder Widening

  17. IH-39 Cost Summary • Estimated As-Built Construction Cost/Mile • $151,570/mile (1984 Dollars) • $337,550/mile (2012 Dollars) • Estimated 10” FDS Construction Cost/Mile • $190,840/mile (1984 Dollars) • $425,010/mile (2012 Dollars) • LCCA Costs • As-built NPV = $456,110/mile • FDS NPV = $535,720/mile • 2012 Project - 8” Shoulders Let Cost/Mile • $333,850/mile

  18. IH-39 Cost Summary Cont… • Adjusted LCCA Costs • As-built NPV = $515,000/mile • FDS NPV = $467,540/mile

  19. USH 41 Existing Cross Section

  20. USH 41 As-Designed/Built Cross Section

  21. USH 41 Theoretical Widening with Incorporation of FDS

  22. USH 41 Cost Summary Actual Widening Cost = $7.28 Million Estimated Widening Cost with Incorporation of FDS = $5.17 Million Cost Savings of $272,000/mile

  23. IH-94 Cost Summary Actual Widening Cost = $3.99 Million Estimated Widening Cost with Incorporation of FDS = $3.07 Million Cost Savings of $178,000/mile

  24. Recommendations • Selective Application of FDS • High Volume Arterial Corridors • Mass Evacuation Routes • Incorporate FDS (Existing and Future) into Emergency Planning

  25. Volumes Estimated For Highest Direction in 30th Highest Hour in 2013

  26. Cost to Implement • Average Outside FDS Cost: $248,575/mile • Average Inside FDS Cost: $165,480/mile • HMA Conventional Shoulder to Concrete FDS • Outside shoulder only: additional $108,100/mile • Both shoulders: additional $164,000/mile • Concrete Conventional Shoulder to Concrete FDS • Outside shoulder only: savings of $28,800/mile • Both shoulders: savings of $41,500/mile

  27. Region Self Implementation • Southeast • N-S and Zoo Freeways • Southwest • IH-39 Corridor Reconstruction • Northeast • USH 41 (Winnebago and Brown Counties)

  28. Questions?

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