access icon free Global sensitivity analysis techniques to simplify the calibration of traffic simulation models. Methodology and application to the IDM car-following model

© The Institution of Engineering and Technology
Received 14/03/2013, Accepted 22/10/2013, Revised 11/10/2013, Published 15/01/2014

As models are simplifications of reality, the management of the uncertainty arising along the whole modelling process is a crucial and delicate operation, which primarily affects the credibility of model results. In the field of traffic simulation to tackle this issue, it is common practice to include the model uncertainty alongside the uncertainty in the parametric inputs. However, reducing the uncertainty in the modelling process through the indirect estimation of the model parameters is far from being simple. In this picture, a key role can be played by model sensitivity analysis. In the present work, in particular, the role of sensitivity analysis in the management of modelling uncertainties is firstly illustrated. Then, one of the most advanced techniques to perform sensitivity analysis is explained and applied to identify, in the specific context of application, which of the input factors of two car-following models can be fixed without appreciably affecting a specific output of interest. Results confirmed the relevance of sensitivity analysis in driving analysts’ activities for models’ comprehension, calibration and validation, namely, for their appropriate use.

Inspec keywords: road traffic; sensitivity analysis

Other keywords: mode lcalibration; IDM car-following model; model validation; traffic simulation model; driving analysts; two car-following models; global sensitivity analysis techniques; model comprehension

Subjects: Systems theory applications in transportation

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