byron becnel la dotd june 16, 2011. microscopic simulation models simulate the movement of...
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Microsimulation Modeling Policy
Byron BecnelLA DOTDJune 16, 2011
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What?
Microscopic simulation models simulate the movement of individual vehicles on roadsIt is used to assess the traffic performance of a highway networkMicrosimulation is the dynamic and stochastic modeling of vehicle movementsMicrosimulation is a tool for traffic studies, design, operations, and public meetings
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Why?
To estimate the effect of different design or operations alternativesTo show the expected improvement from existing to proposed conditionsTo provide a visual representation of a transportation projectTo help in the decision making process
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When?
Use when approved by DOTD Traffic Modeling EngineerWhen defined in the project scope of workUse where traffic congestion problems existWhen other tools are limitedUse when time and funding are available
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Policy
Microsimulation Policy and Guidelines documentsTwo softwares: VISSIM and CORSIMPolicy in place to get a good work product, and to use modeling as an appropriate analysis toolDefines phases and deliverablesBased on Traffic Analysis Toolbox Volume III
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VISSIM Picture
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VISSIM Model
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CORSIM Picture
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CORSIM Model
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Process
1) Project scope2) Data collection3) Base model development4) Error checking5) Calibration6) Alternatives analysis7) Final report
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Flowchart
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Where to Model
Urbanized freeway segmentsCongested arterial highwaysCorridors with closely spaced signalsRoundabouts with nearby signalsComplex geometric configurations
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Where to not Model
Isolated stop or signal intersectionsRural highway segmentsIntersection improvementsLow volume local or collector roads
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Selecting Proper Tool
Simulation Needed!Simulation…..
Probably Not Needed!
Source: UW TRAC and CH2M HILL, Introduction in Traffic Simulation
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MOE
Measures of effectiveness such as travel time, average speed, delay, queue lengths, and VMT
Sample Report Results TableMOE No Build Alt 1 Alt 2
Travel Time (min)
9 5 6
Avg Speed (mph)
20 36 30