Using conceptually corresponding models for car and PT travel time calculations is the key to achieving a more reliable analysis of modal accessibility disparity. Furthermore, the door-to-door approach in travel time calculations also makes the results truly comparable in absolute terms. In all, the most detailed analyses of accessibility disparity seem to be possible only with the more advanced models. Clearly, these models are also the most data hungry and accordingly, possibilities of using such models depend among other things on data policies of transport-related data providers. In our case, the European INSPIRE initiative (http://inspire.jrc.ec.europa.eu/) and general development towards openness in data policies among public administration have markedly increased the possibilities of analysing multi-modal transport. However, certain simplifications – such as the average park search times in our case – might be necessary if better data sources are lacking.