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Britton Hammit, Kimley-Horn Jiaxin Tong, Kimley-Horn Sanhita Lahiri, VDOT VDOT VISSIM User Guide 2020 SimCap Meeting January 14, 2020
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Britton Hammit, Kimley-Horn Jiaxin Tong, Kimley-Horn ...wdcsite.org/wp-content/uploads/2020/01/05_SimCap_VissimUserGuide.pdf · Britton Hammit, Kimley-Horn. Jiaxin Tong, Kimley-Horn.

Mar 17, 2020

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Page 1: Britton Hammit, Kimley-Horn Jiaxin Tong, Kimley-Horn ...wdcsite.org/wp-content/uploads/2020/01/05_SimCap_VissimUserGuide.pdf · Britton Hammit, Kimley-Horn. Jiaxin Tong, Kimley-Horn.

Britton Hammit, Kimley-HornJiaxin Tong, Kimley-HornSanhita Lahiri, VDOT

VDOT VISSIM User Guide

2020 SimCap Meeting

January 14, 2020

Page 2: Britton Hammit, Kimley-Horn Jiaxin Tong, Kimley-Horn ...wdcsite.org/wp-content/uploads/2020/01/05_SimCap_VissimUserGuide.pdf · Britton Hammit, Kimley-Horn. Jiaxin Tong, Kimley-Horn.

Outline

• Introduction

• Overview of Contents

• Vissim 11 Evaluation

• Calibration Guidance

• Conclusions

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Purpose and Need• Supplement VDOT Traffic Operations and Safety

Analysis Manual (TOSAM).

• Provide guidance and Virginia best practices for model development and analysis.

• Maintain consistency for peer and agency review.

• Promote the quality and consistent VISSIM analysis in support of decision making for project planning and infrastructure.

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User Guide Contents• Model Development

• Model Review and Debugging

• QC Checklist

• Results and Preparation

• Calibration Guidance

• Model Scenarios

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Vissim 11 Evaluation

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Vissim 11 EvaluationObjectives• Improve understanding of Vissim 11 to

provide VDOT recommendation on its adoption for new projects.

• Provide guidelines for running legacy models in Vissim 11.

• Highlight differences in parameter sensitivities between Vissim 11 and legacy software versions.

• Update existing Vissim calibration guidance.6

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Questions of Interest1. Will Vissim models calibrated in legacy

Vissim versions remain calibrated when run directly in Vissim 11?

2. Do these driving behavior model changes elicit a change in calibration guidance for specific parameters?

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Legacy Vissim Models• Compare the results of previously calibrated

models in prior versions of Vissim with the results obtained by running those models in Vissim 11.

• 10 Calibrated Models (5 Networks, AM/PM)• Models selected with varying network sizes,

network features, and operational conditions.

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Legacy Vissim Models

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Name Maintained Calibration in Vissim 11

Primary MOE Difference between

Versions

Severity of MOE Difference

Route 7 AM No Queue Length Moderate

Route 7 PM No Travel Times Substantial

Route 28 AM Yes - -

Route 28 PM No Freeway speeds Substantial

Seminary Road AM No Freeway speeds Substantial

Seminary Road PM Yes Freeway speeds Moderate

I-95 AM Yes - -

I-95 PM No Speed Criteria Moderate

Route 123 AM No Travel Times Substantial

Route 123 PM No Travel Times Substantial

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Potential Causes• Unique traffic conditions

• Model development

• Model calibration

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Model Development

AM Model Calibration

PM Model Calibration

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Calibration

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CalibrationAdjust these:

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CalibrationUsing these:

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Freeway Car Following Model (Wiedemann 99) – Calibration Parameters

Parameter Default Value Unit

Suggested Range

Basic Segment

Weave/Merge/Diverge Segment

CC0 Standstill distance 4.92 feet (ft) 4.5 to 5.5 >4.92

CC1 Headway time 0.9 seconds (s) 0.85 to 1.05 0.90 to 1.50

CC2 ‘Following’ variation 13.12 ft 6.56 to 22.97 13.12 to 39.37

CC3 Threshold for entering ‘following’ -8 -- Use default

CC4 Negative ‘following’ threshold -0.35 -- Use default

CC5 Positive ‘following’ threshold 0.35 -- Use default

CC6 Speed dependency of oscillation 11.44 -- Use default

CC7 Oscillation acceleration 0.82 ft/s2 Use default

CC8 Standstill acceleration 11.48 ft/s2 Use default

CC9 Acceleration at 50 mph 4.92 ft/s2 Use default

Arterial Car Following Model (Wiedemann 74) – Calibration Parameters

Parameter Default Value Unit Suggested

Range

Average standstill distance 6.56 feet (ft) 3.28 to 6.56

Additive part of safety distance 2.00 -- 2.0 to 2.2

Multiplicative part of safety distance 3.00 -- 2.8 to 3.3

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CalibrationTo reach these:

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Calibration Styles

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Calibration Styles

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Differences in Calibration Style

• Activation of the Cooperative Lane Change parameter at merge, diverge, and weaving segments.

• A low Safety Distance Reduction Factor.

• Activation of the Advanced Merge parameter.

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Cooperative Lane Change

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Cooperative Lane Change

Activated

Calibrated

Route 28 AM

I-95 AM

Not Activated

Uncalibrated

Route 28 PM

I-95 PM

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Cooperative Lane Change

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Route 28, AM ModelCLC Activated - Calibrated

Field Vissim 9 Vissim 11 Field Vissim 9 Vissim 11

Route 28, PM ModelCLC not Activated – Not Calibrated

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Safety Distance Reduction Factor

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Safety Distance Reduction Factor (SDRF)

0.25

Uncalibrated

Seminary Road AM

Route 123 AM

Route 123 PM

0.55

Calibrated

Seminary Road PM

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Safety Distance Reduction Factor

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Seminary Road, PM ModelSDRF Near Default – Calibrated

Field Vissim 9 Vissim 11

Field Vissim 9 Vissim 11

Seminary Road, AM ModelSDRF Significantly Below Default

– Not Calibrated

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Advanced Merge

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Advanced Merge

Activated

Calibrated

Route 28 AM

Seminary Road PM

I-95 AM

Not Activated

Uncalibrated

Route 28 PM

Seminary Road AM

I-95 PM

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Summary• Models that were previously calibrated in legacy

versions of Vissim were more likely to maintain calibration in Vissim 11 when

• Cooperative Lane Change and Advanced Merge features were activated.

• Safety Distance Reduction factor was maintained at a conservative value near default.

• When converting a calibrated legacy model to Vissim 11, time and resources should be allotted to re-visit model calibration and fully QC model operations.

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Questions of Interest1. Will Vissim models calibrated in legacy

Vissim versions remain calibrated when run directly in Vissim 11?

2. Do these driving behavior model changes elicit a change in calibration guidance for specific parameters?

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Page 24: Britton Hammit, Kimley-Horn Jiaxin Tong, Kimley-Horn ...wdcsite.org/wp-content/uploads/2020/01/05_SimCap_VissimUserGuide.pdf · Britton Hammit, Kimley-Horn. Jiaxin Tong, Kimley-Horn.

Calibration Parameter Evaluation• Sensitivity analysis of parameters in Vissim 9

and 11 to study the impact of changes in parameter values on model outputs

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5 Models

17 Parameters

4 Parameter Values

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Summary of Findings• Updates to lane change algorithms in Vissim 11

should yield smoother traffic flow under the default parameter settings.

• Thus, modelers should need to make fewer changes towards a more “aggressive” driving behavior settings.

• Safety Distance Reduction Factor• Lane Change Distance

• No evidence that previously-established recommendations for parameter ranges need to be revised.

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Findings Practical GuidanceEvidence that some “Calibration Styles” arepreferred over others.

• Narrowing ambiguity in the calibration process.• Improving resulting model robustness,

transferability, and consistency.

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Calibration Guidance

• Calibration parameter definitions

• Calibration plan

• Pre-Calibration set-up

• Calibration guidelines

• Calibration steps and structure27

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Calibration Guidelines1. Activate cooperative lane change at all merge,

diverge, weaving segments.

2. Keep freeway car-following model parameters CC0 and CC1 consistent between all connected freeway links.

3. Freeway car-following model parameter CC2should be greater in merge, diverge, weaving segments compared to basic segments.

4. Safety Distance Reduction Factor adjustment should be a last resort in model calibration.

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CC1 Consistency

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CC1 = 0.9 sec

CC1 = 1.1 sec

CC1 = 1.2 sec

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Round 1Iterative adjustments of:• CCO/CC1• CC2 for “basic segments”• CC2 for “merge, diverge, and weaving segments”• Lane Change Distance

Round 2Iterative adjustments of:• Additional seeding conditions• Lane change deceleration parameters• Cooperative Lane Change parameters• Minimum Net Headway lane change parameter

Round 3Iterative adjustments of:• Addition of special Driving Behavior Containers• Safety Distance Reduction Factor lane change parameter

Freeway Corridor Calibration

Only if necessary

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Summary

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• Model calibration will always be an iterative, trial-and-error procedure with numerous uncertainties.

• VDOT’s user guide introduces new guidelines and steps that can be used to structure this iterative procedure to improve consistency, efficiency, and model validity.

VISSIM User Guide is available at http://www.virginiadot.org/business/resources/VDOT_Vissim_UserGuide_Version2.0_Final_2020-01-10.pdf