VISSIM Protocol
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Transcript of VISSIM Protocol
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VISSIM Protocol
ITE Oregon Traffic Simulation RoundtableMay 31, 2012
Chi Mai
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Presentation Overview Background of VISSIM Use at ODOT Process for Protocol Development Chapter by Chapter of Protocol Resources for VISSIM Model Development Questions and Feedback
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BackgroundJune 2005 – ODOT purchased VISUM and VISSIM package license through Metro
June 2011 - ODOT Updated VISSIM Protocol – Expanded to Include Arterials and for Statewide Use
October 2007 - ODOT Developed VISSIM Protocol for Freeways
First Project Submittal Using VISSIM
Since Adoption of Updated VISSIM Protocol - Sketch level analysis for I-5 Rose Quarter Project - Corridors Bottleneck Operations Study
Use of VISSIM Increased - CRC - Airport Way Interchange - Sunrise - OR43 Streetcar - Milwaukie Light-Rail - Operational Corridors - Beltline Hwy Ramp Meter Study
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Development Process in Updated Protocol
Review lessons learned
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Lessons Learned from First Protocol
More detail on the process of developing VISSIM projectsIs VISSIM the right tool?Project scoping detailsCheck-in points
Wanted to develop something that was consistent with FHWA guidelines
ODOT could benefit from protocols specific to arterials and for statewide use
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Development Process in Updated Protocol
Review lessons learned Interview other government agencies
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Lessons Learned about VISSIM Don’t work in parallel Review process should include as many
check-in points as possible Software is always evolving and
consultants are learning VISSIM along with agencies
VISSIM has vast capabilities, however, budget and schedule are often the contraint
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Development Process in Updated Protocol
Review lessons learned Interview other agencies Researched for similar documents
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Development Process in Updated Protocol
Review lessons learned Interview other agencies Researched for similar documents Researched FHWA’s guidelines
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Objective of Protocol Use VISSIM at the right time for the right
projects Clear understanding of the project
between agency and consultant from the beginning of the project
Minimizing a project from evolving throughout the development
Minimize back and forth
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Development Process in Updated Protocol
Review lessons learned Interview other agencies Researched for similar documents Researched FHWA’s guidelines One-day brainstorming session
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VISSIM Project Development
One-day brainstorming session led to
concept of VISSIM project development
process
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Putting Together the Updated Protocol
Developed outline – 10 chapters Chapter by chapter review Full draft review Final submittal of protocol All-day training on VISSIM and use of
protocol
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Note VISSIM protocol is not aimed at being a
training document Intended to be a Guidance document to
help ODOT develop successful VISSIM projects
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Ch 1 - Project Understanding Stimulates thoughts and understanding on
project between ODOT and consultants up-front
Gives ODOT the means to help determine the appropriate analysis tools for projects
Smooths process for both ODOT and consultant
The result of this chapter is the Project Problem Statement
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Ch 2 – Project ScopingThe result of this chapter is the development of the Project Methods and Assumptions document which outlines: Project Boundary/Study Period Analysis Tools Being Used Scheduling/Staffing Plan Data Collection Plan Calibration Targets Measures of Effectiveness
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Ch 3 - Data Collection What data is needed and how it should be
collected? Data check-in points were added based on
previous experience of lack of providing it soon enough
Provides an idea of essential data and project specific additional recommended data
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Project Specific Data Collection Streetcar Project (arterial) – Detailed Transit DataDetailed Bike and Pedestrian DataSignal Timing Data
Freeway Model – Spot Speed DataRamp Meter RatesBottleneck Locations
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Ch 4 - Model Development Develop standards for overall model
development Allow for modeler the ability to deviate from
the guidelines (need to document deviations) More detailed standards for ramp meters More detailed standards for roundabouts Standards for vehicle fleet setup (AASHTO
standard vehicles) Provide a better understanding of conflict
points vs. priority rules
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Model Development CHECK-IN POINTS! Identify problems before too far into the project:
Geometry Volumes Control Coding Data Collection Points
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Ch 5 - Error Correction Checklist to help modeler Review animation Error files
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Ch 6 - Calibration Essential calibration and project specific
calibration parameters to use Calibration targets outlined in the beginning
of the project and those targets are fixed! Minimum number of simulation runs
formula Deliverables:Base calibrated modelCalibrated Methodology and Results Report
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Ch 7 - Additional Base Year Scenarios
Additional base year model with different time period can be developed at this time
Ensure that work is not done in parallel
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Ch 8 - AlternativesSpecifies the following order of work delivery: Future No-Build traffic volumes Future No-Build model with corresponding
documentation Future Build scenarios traffic volumes Future Build models with corresponding
documentation
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VISSIM Project Development
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Ch 9 - Reporting Guidance of what both ODOT and
consultant are expected to do with model output data
Post processing details and examples Guidelines to help both consultant and
ODOT where needed:95th Percentile QueueV/C Ratio – not typical output from VISSIMEmissionDelay and HCM complianceSample Report Format
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Ch 10 - Reviewing How do we minimize the back and forth? ODOT wanted a check-list Helps consultant know what will be reviewed
and how it will be reviewedHelps ODOT know what to look forHelps both have an understanding of level of
effort and time frame that will be needed
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VISSIM Protocol ODOT Analysis Procedures Manual
Addendum Chttp://www.oregon.gov/ODOT/TD/TP/APM.shtml Consistent with FHWA’s Traffic Analysis
Toolbox Manuals Provides ODOT expectations, guidelines,
and requirements when considering use of VISSIM as an analysis tool
Shall be followed on all VISSIM analysis for ODOT studies and projects
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Resources for VISSIM Model Development
Metro DTA Model Traffic Simulation Roundtable INRIX Data
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INRIX Data Another source of data for VISSIM
calibration ODOT purchased 2008-2010 Data Can be shared with other public agencies Available to consultants for work on ODOT
projects Data is very rich inside Metro area ODOT looking into purchasing more data
and the Analytics Suite
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Questions and Feedback?