The climate and mobility change we are striving for is a matter of great urgency. In order to achieve these goals, measures must be optimized in terms of their impact and be implemented swiftly. Tools for evidence-based decision-making and planning must take into account the high complexity of multidimensional causal relationships on the one hand and ensure transparency, comprehensibility and user-friendliness on the other. Such tools are still lacking, particularly for use at a municipal level. Open data paired with expert and user knowledge form the basis for the efforts in LMI-S to design such a tool.