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One of the great endeavours taken by transportation engineers to alleviate congestion is the development of advanced transportation information systems (ATIS). By providing accurate traffic information drivers could economize on travel time promoting network wide savings and benefits. However, recent attempts to predict the expected effect of ATIS systems are based on the assumption that the behaviour of individual travellers can be approximated with the assertion that they maximize expected utility. That is, individual travellers are assumed to minimize expected trip costs (or trip disutility) choosing the most efficient routes between any given origin anddestination, with a system resulting in a stable network equilibrium. This modelling approach, although elegant and parsimonious, has been criticized for lacking a sound psychological basis ignoring drivers' cognitive limitations. Whereas almost all studies agree …