Thanks to new development in Intelligent Transportation Systems, real-time management systems are used for improvement of transportation systems organisation. In the Swiss context, it becomes obvious that a national traffic management centre is necessary, where such tools are indispensable for efficient real-time management. They must be able to capture transportation demand, and to exploit in real-time all available data, to compensate missing data with accurate and performant models, and to develop anticipative strategies, based on prediction models. These tools allow  an operational approach of ITS. In order to benefit from them in Switzerland, it is crucial to develop appropriate demand models predicting traveller behaviour.