The user of a road network chooses his route and/or departure time on thebasis of his knowledge about the network state. Owing to the development of traffic measurement, data processing and telecommunication techniques, road information has kept improving both in scope, quality and availability. The objective of the paper is to model the value of a road information device to a user, and more widely to the society. To gain insight into these issues, a model of route choice with two classes of users respectively equipped and better informed with a dynamic component, or unequipped and less informed was developed. The behaviour of each class was modelled and also their interaction under specific assumptions of congestion, disruptionand perception. The effective cost taking into account the congestion andthe random disturbances and the subjective cost as perceived by a user onthe basis of the information which is available was also modelled. Model sensitivity was simulated with respect to two parameters: the total volumeof demand and the rate of equipment, which determines the level of congestion and the population in each class. The individual profit of using the information is addressed on the basis of specific indicators: the average cost undergone by each user class and the average cost to all the network users. Much emphasis is put on the physical and economic significances of the random disturbances on the traffic conditions, thus inspiring the stochastic assumptions made. This sharpness of interpretation distinguishes this model from previous approaches: the model of Maher and Hughes (1995) isshown to be irrelevant, as would be any naive model designed under commercial software for static traffic assignment. For the covering abstract seeITRD E145999
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