Vehicular traffic models as complex dynamical systems have been widely studied. However, challenges in obtaining reliable forecasts are still present, also due to inherent uncertainty. In this talk, we will explore the effects of uncertainty across different scales of observation, employing both intrusive and non-intrusive approaches for a more comprehensive analysis. This is a joint work with M. Herty (RWTH Aachen) and L. Pareschi (University of Ferrara).