United States Department of Transportation
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VISSIM™ Simulation Calibration Procedure
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2024-04-01
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[PDF-11.88 MB]
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Edition:Final Report October 2022 – April 2024
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Abstract:Underlying most VISSIM™ calibration is the adjustment of the Wiedemann car following parameters used to simulate vehicle behavior within the model. The Wiedemann models directly influence a roadway segment’s capacity, saturation flow, density, etc. Several key features were identified as part of this study. Through the project a calibration approach that seeks minimal changes in car following parameter settings has been developed. The developed method focuses on desired speed distribution and several key parameters of both the Wiedemann 99 and Wiedemann 74 models. Key concepts for the suggested calibration steps presented in the appendix include: car following calibration is performed at the link level; evaluation metrics include speed-flow diagrams and headway distribution; calibrated parameter sets for critical or typical links may be applied to links throughout the model; calibration includes setting of the desired speed distribution; the method seeks to limit deviations from defaults parameters, focusing on a select subset of car following parameters; and finally the approach is flexible, leveraging expert judgement of model developer and design team. The final calibration is an iterative process including: 1) checking field conditions against selected default values; 2) calibrating desired speed; 3) calibrating key Wiedemann parameters; and 4) validation. Through this focused approach the method reduces the likelihood of unrealistic parameter interaction effects and allows the simulation modeler to understand the potential impact of any calibration adjustments. While the proposed method may be applied to additional car following parameters the discussed select parameters and calibration approach should be sufficient for most modeling efforts.
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Content Notes:Supporting file includes an appendix.
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