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Transferability of calibrated microsimulation model parameters for safety assessment using simulated conflicts.

Mohamed Essa1, Tarek Sayed1

  • 1Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada.

Accident; Analysis and Prevention
|August 31, 2015
PubMed
Summary

Traffic simulation model calibration parameters are transferable between sites, improving correlation between simulated and real-world conflicts. This research confirms VISSIM parameter transferability enhances traffic safety analysis.

Keywords:
Automated conflict analysisSurrogate Safety Assessment Model (SSAM)Traffic conflict simulationTraffic conflictsTransferability

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Area of Science:

  • Traffic engineering
  • Transportation safety
  • Computational modeling

Background:

  • Micro-simulation models like VISSIM are used for traffic safety analysis.
  • Calibration of simulation parameters is crucial for accurate conflict prediction.
  • Transferability of calibrated parameters between sites is not well-established.

Purpose of the Study:

  • To investigate the transferability of calibrated VISSIM parameters for safety analysis between different signalized intersections.
  • To determine if calibrated parameters from one site yield reasonable safety analysis results at another site.
  • To compare the correlation of field-measured and simulated conflicts using transferred versus site-specific calibrated parameters.

Main Methods:

  • Utilized 83 hours of video data from two signalized intersections in Surrey, BC.
  • Employed automated video-based computer vision for trajectory extraction and rear-end conflict identification.
  • Applied VISSIM calibrated parameters from one intersection to analyze conflicts at a second intersection, comparing with site-specific calibration.

Main Results:

  • VISSIM parameters demonstrated general transferability between the two studied locations.
  • Transferred parameters yielded a better correlation between simulated and field-measured conflicts than default parameters.
  • Out of six key parameters, two were directly transferable, three partially transferable, and one not transferable.

Conclusions:

  • Calibrated VISSIM parameters show promise for transferability in traffic safety analysis across different sites.
  • Transferring calibrated parameters offers improved accuracy over default settings for safety assessment.
  • Further research is needed to understand the extent and limitations of parameter transferability for micro-simulation safety analysis.