Abstract
This paper models driver behaviour in a way that allows us to define the driver's overall driving skills in a fruitful manner. Thus, the model enables us to capture the main influence of training courses on driving. The model's results are seen in the light of a Norwegian investigation that concluded that slippery surface driving courses have increased traffic accident rates significantly. Norwegian car drivers seem to overestimate the driving risk before they pass these courses, which reduce drivers' risk perception relatively more than they reduce the objective risk of skidding. (A)