Use of Full Depth Shoulders on Wisconsin Highways Steve Krebs, Bob Arndorfer, and Jed Peters – DTSD-Bureau of Technical Services April 29, 2013
Dec 17, 2015
Use of Full Depth Shoulders on Wisconsin Highways
Steve Krebs, Bob Arndorfer, and Jed Peters – DTSD-Bureau of Technical Services
April 29, 2013
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
Overview of presentation
2
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
Literature Review
3
Pavement Distress NE Region SE Region NW Region
Preventative Measures
Pavement Performance Observations
5
10 Projects Analyzed 8 Concrete Mainline 2 HMA Mainline
As-built and Estimated FDS Costs
FDS Construction and Cost Considerations - Overview
6
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
Construction Cost Summary
10
Costs/Impacts not Considered Maintenance Schedules
Conventional FDS
Time Value of Money
Life Cycle Cost Analysis (LCCA) - Overview
11
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
LCCA– Summary
12
LCCA vs BCA Dissimilar Alternative: User Delay
Conventional Shoulder User Delay NPV = $146,830/mile
Benefit Cost Analysis (BCA)
14
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
BCA– Summary
15
Non-Denominated IH-43 IH-94
Denominated IH-39 – Shoulder Replacement IH-94 – Shoulder Widening USH 41 – Shoulder Widening
Additional Identified Benefits
16
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
IH-39 Cost Summary
17
Adjusted LCCA Costs As-built NPV = $515,000/mile FDS NPV = $467,540/mile
IH-39 Cost Summary Cont…
18
Actual Widening Cost = $7.28 Million Estimated Widening Cost with Incorporation of
FDS = $5.17 Million Cost Savings of $272,000/mile
USH 41 Cost Summary
22
Actual Widening Cost = $3.99 Million Estimated Widening Cost with Incorporation of
FDS = $3.07 Million Cost Savings of $178,000/mile
IH-94 Cost Summary
23
Selective Application of FDS High Volume Arterial Corridors Mass Evacuation Routes
Incorporate FDS (Existing and Future) into Emergency Planning
Recommendations
24
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
Cost to Implement
26
Southeast N-S and Zoo Freeways
Southwest IH-39 Corridor Reconstruction
Northeast USH 41 (Winnebago and Brown Counties)
Region Self Implementation
27