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© 2014 HDR, all rights reserved.
2016 OTECAdam Lynch
Boosting CRAVETM
with the Power of VISSIM
October 26, 2016
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Value Engineering (VE)
Cost Risk Assessment
(CRA)
HDR’s CRAVETM
Importance of Vissim
Topics Covered
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Improves the Value
Solution based
More than Cutting
Corners
The TraditionalValue Engineering (VE)
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Value = Increase in
Benefits-to-Cost Ratio
Is that enough?
The TraditionalValue Engineering (VE)
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What could go wrong?
How much could it cost
What if this risk could be mitigated?
Traditional Cost-Risk Analysis (CRA)
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CRA – Loosing great
ideas
VE – Add more risk?
Shortfalls of Independent CRA and VE studies
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CRAVE™ combines Cost
Risk Analysis + Value
Engineering in one
coordinated workshop.
Benefits:
o Improves delivery;
o Optimizes solutions
o Mitigates quantified risks
Introducing HDR’s CRAVETM
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Proven process
Proven results on a wide range of projects, including:
o Bridges
o Highways
o Heavy and light rail alignments
o Ports
o Airports
o Tunnels
o Water treatment facilities
o Pipelines
Won national awards for process
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Proven process(2 to 5 Days)
1. Get up to speed
2. ID Baseline Risk & Performance weights
3. Brainstorm Alts
4. Rank (Fatal Flaws)
5. Preferred VE Alt
6. Analyze
7. Final Score / Report
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Risk BaselineContingency: Traditional vs. Risk-Based Approach
Environmental
Requirements
30%
Project Base
Cost
Geotech
20%
Materials
40%
Design
5%
Project Base
Cost
Fixed Contingency %
Hone in Actual Risk-Based Contingency
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Threat – Something that
increases Risk
Opportunity –Something that decreases Risk
Risk AssessmentThreat vs. Opportunity
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Risk Severity and
Occurrence
“How much would cost
impact if ____ happens?”
Risk Assessment
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Brainstorming & Ranking
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Analysis depends heavily
on traffic!
CRAVETM onTransportation Projects
Mainline Operations
Local Operations
Maintainability
Construction Impacts
Environmental Impacts
Compatibility
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Major urban projects
DDI’s, roundabouts, SPUI’s,
Managed Lanes
Lots of weaving
Highly congested corridors with
strange lane utilization
Complex intersections
Long queuing
Possible Transportation Projects Challenges
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Versatile “Fast” Perform
System-wide
Evaluations
Balance of
Presentation &
Results
Using VISSIM with CRAVETM
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Case Study: US 18 ( Verona Rd), Madison, WIExisting
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Case Study: US 18 ( Verona Rd), Madison, WIBaseline Alternative
Grade Separated Interchange
(10-Lane Structure)
Grade Separated Interchange
(4-Lane Structure)
Traditional
At-Grade Separated
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Case Study: US 18 ( Verona Rd), Madison, WIBaseline Alternative
10-lanes!
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Case Study: US 18 ( Verona Rd), Madison, WIBrainstorming
Typical “Texas-Style” Frontage Rd Ramp Concept
Mainlines
Frontage Rd
Frontage Rd
Cro
ss S
t
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Case Study: US 18 ( Verona Rd), Madison, WIBrainstorming
Modified “Texas-Style” Ramp Concept
a.k.a “X-Ramp”Mainlines
Cross Street
Ramps
Frontage Rd
DDI DDI
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Case Study: US 18 ( Verona Rd), Madison, WIPreferred Alternative
At-Grade T Intersection
DDI # 1
DDI # 2
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Synchro Import
o Basic geometry
o Signals
Calculated Routing decisions for whole
corridor
MOEs for Baseline alt in VISSIM
Coded CRAVE Preferred Alt
o DDI Interchanges
o Frontage Rd
o Raymond Rd
Apples to Apples Comparison
o Still Conceptual Study
o Minimal Calibration needed
Case Study: US 18 ( Verona Rd), Madison, WIModeling Process
Synchro
Vissim
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Increased Benefit-Cost
Ratio
Reduced project Cost!
o$14 million dollars
Success!
Case Study: US 18 ( Verona Rd), Madison, WIResults
Synchro
Vissim
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Case Study: US 18 ( Verona Rd), Madison, WI
Vissim Model
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QUESTIONS?