Abstract
The objectives of driver information systems have been progressively enlarged in order to meet better the user's needs and to reinforce the relationship with the drivers. This evolution led to investigate new media such as the radio and in-car systems. New actors are attracted by a potential new market. In order to select the best system, and how to operate it, it has been necessary to develop specific evaluation tools. The paper presents the methodology that has been developed by the French motorway companies in co-operation with the Ministry of Transport. (A)