Among the simulation approaches, the activity-based approach is used increasingly in operational models. It allows both to focus on individual behavioural rules, and to model behaviour at a much finer level than more aggregated approaches. A behaviour that one can and should model is the joint travel behaviour: the fact that several individuals may travel in the same private vehicle. An appropriate modeling of such a behaviour is important both for detailed simulations of households behaviour

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... d for the evaluation of some policies, like incentives to perform car-pooling. We present an approach to include such a simulation of joint travel in a multi-agent microsimulation, considering the case of MATSim as an example. First results of this approach for the case of intra-household joint trips on a simple scenario are presented.