Use, Calibration, and Validation of Traffic Simulation Models in Practice: Results of Web-Based Survey
Résumé
This paper reports on the results of a web based survey conducted as part of the MULTITUDE project (Methods and tools for supporting the Use caLibration and validaTIon of Traffic simUlation moDEls). The project, being performed in Europe, is attempting to focus and drive forward the issue of 'model validity' and thereby calibration and validation methods and their usage in simulation. As part of this, an assessment of the state-of-the-practice has been performed, examining among other things how models are applied what procedures are used for calibration and what guidelines are followed. The basis for this state-of-the-practice, is a web based survey which ran in the latter quarter of 2010 and obtained 215 responses. The paper details the finding of this survey which, while lengthy, substantiates two clear messages. Firstly, that Calibration, Validation and Sensitivity analysis although now more widespread than was previously thought, are still far from being required procedure, and secondly that while guidelines are increasingly in use, governing for example number of simulation runs, there are still many regions where this does not occur and indeed there is still much reliance on personal experience and habit, especially in situations where network characteristics become large. The results of the survey underpin the need for further focus on the use of models and procedures for calibration and validation, and indicate, more specifically, the areas that MULTITUDE will focus on in the near future.
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