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![Page 1: Operational Analysis for Interstate Access Modifications › accessmanagement.info › AM06pdf › AM0… · Operational Analysis for Interstate Access Modifications I-405 Corridor](https://reader030.vdocument.in/reader030/viewer/2022041103/5f02ed9c7e708231d406b433/html5/thumbnails/1.jpg)
Operational Analysis for Interstate Access Modifications I-405 Corridor Experience
August 15, 2006Karl Westby Ph.D
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I-405 Corridor Today
Seattle, WA3+Million Population30-Mile Corridor200,000+ ADT1 HOV and 2 GP LanesHOV’s Used Extensively
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Improvement ProjectSeparated HOV LanesHOV Direct Access Interchanges5,000 New Park-and-Ride SpacesTwo Additional Lanes of CapacityMultiple Implementation PhasesRebuild/Construct 25-30 Interchanges
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Interstate Access ChangesFHWA Additional Interchanges to the Interstate System
8-Point Access, Interchange Justification Report, Access Point Decision ReportRequires Detailed Operational AnalysisTraditionally Highway Capacity Manual Based CalculationsUnderstand Implications of Access Modifications
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Traditional Analysis IssuesTraditional Approach Has Challenges
4,200 Separate Capacity Calculations Required With HCSHOV and HOT Lane Modeling DifficultiesRamp Meter, Complex Weaving DifficultiesBottleneck Relocation Not RealizedResults Difficult to Explain
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New Capacity AnalysisVissim Microsimulation Model6 Hour Peak PeriodsEntire 30-Mile Corridor Modeled
25-30 Interchanges170+ Intersections6 Additional Freeways
Largest Vissim Model in U.S.
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New Analysis Issues
FHWA Comfort LevelNot HCSLocal Street-Freeway InterfacesData Presentation
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New Analysis SolutionsFHWA Comfort Level
Access Analysis for FHWAOver the Shoulder Review of ModelingFHWA National Expertise InvolvementStrictly Followed FHWA MicrosimulationGuidelines
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New Analysis SolutionsNot HCS
Comparison Made Between HCS and Vissim ResultsHCS Similar in Simple Freeway AreasHCS Similar in Basic Weaves, Merges/Diverges Vissim Better in Complex Weaves, Merges/Diverges, HOV-HOT Lanes
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New Analysis SolutionsLocal Street Freeway Interfaces
Not Possible/Practical to Model Freeway Corridor and Intersections In VissimIntersections Modeled in CorsimLinked Input/OutputAble to Demonstrate Operational Changes of New Access Points
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New Analysis SolutionsData Presentation
Temporal Congestion Charts• Doppler Charts• Brain Scans
Ability to Relay Large Amounts of Information in One ChartWell Received by FHWA, Agencies, General Public
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Congestion Charts - SpeedNo Action Improvement
360 Calcs Each
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Congestion Charts - LOSNo Action Improvement
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Congestion ChartsOnly Operational Data Presented in Master IJR DocumentEasy to Understand Local and Corridor Impacts of Access Changes Including New Access PointsAbility to Deal With Real Issue of Bottleneck Relocation.
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Long Term ResultsNew Way of Modeling Corridor Operations for Access Management PlansBetter Understanding of Access and Operations LinkagesBetter Tools for Relaying Complex, Large Corridor Performance to Make Informed Decisions
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Operational Analysis for Interstate Access Modifications I-405 Corridor Experience
August 15, 2006Karl Westby Ph.D