We carried out an observation survey of passengers on metros, trams and buses in Brussels to investigate their multitasking activities while travelling. The aim was to identify if the mode of transport, travel distance, level of crowdedness, the proportion of underground sections and demographic characteristics of passengers have an impact on the type of activities performed on board with special attention to the frequency of the use of information and communication technology (ICT) devices. The results showed that the range of multitasking activities is not significantly different on buses, trams and metros. We showed that it is travel distance, the presence of travel companion and socio-demographic characteristics (age, gender) that are more important determinants of multitasking activities and the frequency of ICT use than travel mode itself in this specific urban context.