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Advanced Traveller Information Systems (ATIS) can be used to collect and disseminate dynamic information about travel times on highway links. One of the potential uses of these systems is to manage incidents. The objective of this research is to show under what incident conditions is it relevant to provide real time traffic information to travellers. A model that uses graphical queueing techniques is utilized to define cases when ATIS is beneficial and cases when it is not, and to evaluate its benefits as measured by travel time savings. The model is applied to a simple road network with two parallel bottlenecks. We analyze an off-peak incident scenario where a user optimal strategy is implemented to disseminate information only to vehicles equipped with ATIS. The different cases of queue evolution that can result are described, benefits to guided and unguided travellers and the sensitivity of benefits to relevant parameters are also analyzed.