As traffic participation is inherently a risky activity, traffic psychology has generated a great number of so- called risk models, i.e, models in which the risk concept plays a major role. Three of these models are attracting a great deal of attention these days. In an attempt to use these models for quantitative prediction in a concrete example (an overtaking manoeuvre) it was found that many model components had not been defined at all, or had been defined only partially, or in a contradictory fashion. Therefore a new model which allows quantitative calculations in term of behaviour alternatives, subjective probabilities of events, and utilities of the outcomes of behaviour alternatives was developed. The concept of risk is more sharply defines as well.
Abstract